The diagram is drawn to full scale. Potentiometer is a device mainly used to measure emf of a given cell and to compare emf’s of cells. Meter Bridge and Problems on It. If not, just connect both ends of the wire tightly. A resistance wire is introduced in gap S and the resistance box is in gap R. One end of the galvanometer is connected to terminal D and its other end is connected to a jockey. Suppose AJ 1 = l 1 is the balancing length for cell E 1. In this article, we shall study the principle, construction, and working of a potentiometer and its uses. Using sandpaper clean the ends of the connecting wires and make sure that the connections are … 3. It consists of a resistance coil 1 m long with a labelled meter scale in parallel to a known emf source of voltage ε and key K.The resistance coil is connected in parallel to a series combination of the resistance X (device under test) whose value is to be found and a known resistance Y. Download PDF for free. 5. The circuit diagram for a meter bridge experiment is shown in the attached figure. Remove the insulation from the ends of the connecting copper wires with a sand paper. Fig. A jockey; 1 high resistance box; Sandpaper; 1 Leclanche cell; 1 set square; 1 voltmeter ; Theory. (b) The length of potentiometer wire will have to be increased so that the length may be measured more accuracy. So on what basis does the rheostat work? The connections are made as shown in the circuit diagram. The point (J) where the galvanometer wire shows full scale deflection is noted. (i) Initially key K is closed and a potential difference is applied across the wire AB. Meter Bridge . R = 2 is set in the resistance box. Figure below shows a diagram of a water circuit. Do not forget to reload this page in order to see the answers. As per definition of emf, it is the potential difference when a cell is in open circuit or no current through the cell. Rh = Variable resistance which controls the current through the wire AB. The four resistances are connected to each other as shown and if the bridge Procedure. Note the deflection in the galvanometer. It is a metal rod with one end as knife edge. The diagram below shows a potentiometer set up. By sliding the Jockey along the wire, a point of contact P 1 for which the galvanometer shows zero deflection is found. Other details are as follows. Comparison of emfs of two primary cells: The circuit diagram is shown in the figure. v1 4Y11 Cambridge IGCSE Physics – past paper questions and answers EXTENSION questions . One terminal of another cell (whose emf E is to be measured) is connected at one end of the main circuit and the other terminal at any point on the resistive wire through a galvanometer G. This forms the secondary circuit. PHYSICS Foundation Tier Paper 1 8463/1F A F : 2 *02* BLANK PAGE : 3 ... . Take out some resistance from the resistance box , ping the key ‘K’ Touch the jockey gently first at length end & then right end of the bridge wire . Record the reading on the ammeter and on the voltmeter . Aim: To compare EMF of two given primary cells using potentiometer. Connect the circuit as shown in the figure. Important Formulas and procedures to find the values of Unknown Resistance using meter bridge @ Byju's. The potentiometer wire AB is 100 cm long. (ii) In order to increase the sensitivity of potentiometer. This is a jockey- As you can see it's got a metal tip and screwcap where we connect the wire The major use of jockey is in eclectric experiment where we make use of long wire with some resistane as a part . Potentiometer wire AB has length = 100 cm and resistance 10Ω. The investigation will involve linking the decrease of one energy store (or work done) to … The connections are made as shown in the circuit diagram. The length of the wire AP 1 = l is measured. 2. In applications where variable resistance is required, potentiometers and rheostat are mostly preferred. a. potentiometer is effectively an ideal instrument of infinite resistance for measuring the potential difference. Principle. In the figure shown for which values of R 1 and R 2 the balance point for Jockey is at 4 0 c m from A. ρ= Specific resistance of potentiometer wire. When AC = 40 cm, no deflection occurs in the galvanometer,find R. Determination of internal resistance of potentiometer. After inserting the key k, jockey is moved on wire AC till galvanometer shows no deflection (point B). Meter Bridge . A cell holder A jockey A resistance wire mounted on a scale Micrometer screw from CS 261 at Colorado School of Mines turning around the circum… Plug the key. 4. Draw an equivalent electric circuit. The diagram below shows a potentiometer set up. Extension 1 . The diagram below shows a potentiometer set up. Other details are as follows. Identify the fault in the circuit and explain, using appropriate equations or otherwise, how it leads to such a one-sided deflection. 2Ω standard resistor covered and labelled X, Resistance box, Meter bridge, Galvanometer, Jockey, 2V accumulator or two × 1.5V laclanche cells, Key and connecting wires. (b) The radius of potentiometer wire (i.e. On touching the jockey near to the end X of the potentiometer wire, the galvanometer pointer deflects to left. Theory (i) The resistance of resistance wire or a coil is given by $$r=\frac{(100-l)}{l}\cdot R$$ where R is the resistance from the resistance box in the left gap, and l is the length of the meter bridge wire from zero ends up to the balance point. Principle. To find resistance of a given wire using metre bridge and hence determine the resistivity (specific resistance) of its material. [2 marks] 13 *13* BLANK PAGE [Turn over] 14 V ∝l . The Jockey … Diagram.- Observations:- (2) (3) Experiment — 1 To determine resistance per cm of a given wire by plotting a graph of potential difference versus current. 9 4. All the other connections should be as shown in the circuit diagram. To test the connection, insert plug in the one way key k 1 and also in between the terminals a and c of the two way key. (a) Working Principle of Potentiometer . Its one end A is connected to the positive terminal of battery B 1 whose negative terminal is connected to the other end B of the wire through key K and a rheostat (Rh). There are 27 questions in all. If both the galvanometer shows null. Fig. Rh), Working of a Potentiometer: Suppose jocky is made to touch a point J on wire then potential difference between A and J will be, At this length (l) two potential difference are obtained, If V > E then current will flow in galvanometer circuit in one direction, If V < E then current will flow in galvanometer circuit in opposite direction. This ensures that the circuit connections are correct. Make all other connection as shown in the circuit diagram . NECO Practical Physics Questions and Answers. To test the connection, insert the key k 1 and note the ammeter reading. I'll interpret your term diagram as "any fancy image that captures some physics".. For this I can hardly recommend anything else then MetaPost.It's on par with TeX in being a little hard to learn but once you do master the basics you won't believe you could have ever used anything else (in particular, GIMP and Inkscape; good analogy here would be to TeX vs. MS Word). Note: The 2020 NECO Practical Physics answers (expo) will be posted here today, 19th November during the NECO Physics Practical exam.Keep checking and reloading this page to know when the answers are posted. If involved with circuit diagram for Performance while doing the experiment 5 mark 3. (i) Measure and record the e.m.f. Current Electricity. On touching the jockey near to the end X of the potentiometer wire, the galvanometer pointer deflects to left. Potentiometer is based on no deflection method. This question paper has four sections: Section A, Section B, Section C and Section D. 3. When R 2 is shunted by a resistance of 1 0 Ω, balance shifts to 5 0 c m. Find and R 2 in ohms (A B = 1 m): Therefore voltmeter can only measure terminal voltage of a give n cell. (a) The resistance per unit length (R/L) of potentiometer wire. when jockey is touched near end Y. 4.1, a student investigates how the potential difference V across a resistance wire depends upon its length x. (iii) The value of known potential difference must be greater than the value of unknown potential difference to be measured. Potential difference (or fall in potential) per unit length of wire is called potential gradient i.e. These solutions are provided by the team of experts and offer the best and accurate solutions to the questions. Circuit diagram XII-Physics_Vol-1) PRACTICAL.indd 308 04-03-2019 11:06:39. Fig. PHYSICS PRACTICAL HANDBOOK HIGHER SECONDARY SECOND YEAR Prepared by B.ELANGOVAN. On touching the jockey near to the end X of the potentiometer wire, the galvanometer. v1 4Y11 Cambridge IGCSE Physics – past paper questions and answers EXTENSION questions . Introduce some resistance in the circuit by taking out some resistance from the resistance box. The potentiometer is a device used to measure the internal resistance of a cell and is used to compare the e.m.f. Physics is a serious subject but sometimes we need a little light relief, take a look at our top 12 physics jokes and as an added bonus we are offering up to 30% off all physics books, use discount code STC314 on the Elsevier store.. 1) What is the name of the first electricity detective? The battery B 1 connected in circuit is called the driver battery and this circuit is called the primary circuit. A resistance wire of a battery or eliminator, voltmeter, ammeter, a rheostat, one plug key, connecting wires etc. Working principle of a Rheostat. Meter Bridge. 4. External Examination marks: 1. For this the current in the primary circuit must remain constant and the jockey must not be slided in contact with the wire. Check that the meter bridge wire is connected. Another means of describing a circuit is to simply draw it. With his last bit of strength, Pierson draws a primitive diagram in the sand with his finger (two parallel lines intersected by a perpendicular line), and then dies. First, I will collect the apparatus I need and set it up as shown in Diagram 1, below. 6. The focal length of the lens in 3.0 cm. The relation between potential difference, emf, and internal resistance of a cell is given by. Jockey; Ammeter; Connecting wires; Real lab Procedure. The leveling screws at the base of TG are adjusted so that the circular turn table is horizontal and the plane of the circular coil is vertical. Connect the resistance wire in the left gap (between c & d) and resistance box in the right gap. The other end of the galvanometer is connected to a jockey. Marks: 70 General Instructions: 1. 2. Measure the e.m.f. In order to understand, the significance of rheostat and its working principle, let us refresh our basic of electric circuits. Using DPDT switch the Leclanche cell is included in the secondary circuit. Meter Bridge. By closing key K 1, the cell E 1 is included in the circuit. XII-Physics_Vol-1) PRACTICAL.indd 305 04-03-2019 11:06:34 Lechlanche cell, jockey and high resistance. P = resistance of AB = kl Q = resistance of BC = k(100 - l) or, If r is the radius of wire and l be its length, then its resistivity will be Precautions: (i) The null point should lie in … A meter bridge, galvanometer, one way key, a resistance box, a battery jockey, unknown resistance wire about 1 meter long, screw gauge and connecting wires. Attendance 5 mark 2. Trailer Jockey Operators Handbook • Change oil in transmission • Change air dryer cartridge • Change brake linings • Clean aftertreatment diesel particulate filter. Introduce a sufficiently high resistance on the resistance box (H.R). (a) The resistance in primary circuit will have to be decreased. 4.1 The student places the jockey on the wire at a point J. 3(a) You are provided with cells, a potentionmeter, an ammeter, a voltmeter, a bulb, a key, a jockey and other necessary materials. One of the most omnipresent electric components is the resistor. 2. NECO Physics Practical Questions. Students can go through these questions to understand the concepts better and score well in the board examination and entrance examinations for various professional courses. The connections are made as shown in the circuit diagram. 4-4 S ERVICE ROCEDURES 4-4.1 F LUID EVELS The engine, power steering, and transmission oil levels may be checked by raising the hood. Next, I will set the power pack on the lowest voltage possible to ensure that the current passing through the circuit isn't too high (which could potentially affect the results because the wire would get too hot). On touching the jockey near to end Y of the potentiometer, the galvanometer pointer again deflects to left but now by a larger amount. The connections should be according to the diagram shown above. Principle of Potentiometer: When a steady current flows through a wire of uniform cross-section the potential difference per unit length of the wire is constant throughout the length of the wire (or p.d. 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