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4.4.1. Uses of electricity
A subsection of Physics, 5054, through 4. Electricity and magnetism
Listing 10 of 84 questions
A lamp is marked 24 V, 100 W. Describe an experiment to check that the electrical power supplied to the lamp is 100 W when the potential difference (p.d.) across it is 24 V. In your account you should • include a circuit diagram, • state the readings that are taken, • show how the result is calculated from the readings. Two lamps are connected in parallel to a 240 V mains supply, as shown in . R Q P lamp B, 380 lamp A, 190 240 V Lamp A has a resistance of 190 Ω and lamp B has a resistance of 380 Ω. Calculate the current at points P, Q and R. Calculate the total resistance of the circuit. shows the same lamps connected in series to the mains supply. S lamp A lamp B 240 V Calculate the current at point S. Calculate the p.d. across lamp A. In a house, all lamps are connected in parallel to the mains supply, not in series. State and explain two reasons for this. In your explanation you may refer to the results of your calculations in and .
5054_s09_qp_2
THEORY
2009
Paper 2, Variant 0
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Questions Discovered
84