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4.2. Electrical quantities
A subsection of Physics, 0625, through 4. Electricity and magnetism
Listing 10 of 718 questions
shows a circuit that includes a battery of electromotive force (e.m.f.) 12 V. A V 20 Ω 12 V The reading on the ammeter is 0.15 A. Calculate the resistance of the circuit. resistance = The variable resistor is adjusted so that its resistance decreases. State what happens to the reading on the ammeter. State and explain what happens to the reading on the voltmeter. The battery is formed from cells of electromotive force (e.m.f.) 1.5 V. Explain, in terms of electrical energy, what is meant by an electromotive force (e.m.f.) of 1.5 V. State how many 1.5 V cells are connected in series to form the battery.
0625_s18_qp_43
THEORY
2018
Paper 4, Variant 3
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Define electromotive force (e.m.f.). shows a circuit. 12 V P Q The two lamps shown are identical. Each lamp has a potential difference (p.d.) of 3.0 V across it and a current of 2.0 A in it. PQ is a length of uniform metal wire. The resistance of PQ is R. Calculate the value of R. R = Another piece of wire is made of the same metal as PQ. The length of the new piece of wire is twice the length of PQ. The diameter of the new piece of wire is twice the diameter of PQ. Calculate the resistance of the new piece of wire. resistance =
0625_s21_qp_43
THEORY
2021
Paper 4, Variant 3
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The electromotive force (e.m.f.) of a battery is 7.5 V. Define the term electromotive force. The battery is connected in series with a variable resistor and a 30 Ω resistor. The battery is made using 1.5 V cells. Draw a circuit diagram that shows all the 1.5 V cells connected to produce an e.m.f. of 7.5 V, the variable resistor and the 30 Ω resistor. The resistance of the variable resistor can be varied from 0 Ω to a maximum resistance of 150 Ω. Using the axes in , draw a graph to show how the current in the circuit varies with the resistance of the variable resistor as it increases from 0 Ω to 150 Ω. Determine and label the value of the maximum current on the y-axis. resistance of variable resistor / Ω current / A
0625_s24_qp_41
THEORY
2024
Paper 4, Variant 1
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Questions Discovered
718