4.2.5. Electrical energy and electrical power
A subsection of Physics, 0625, through 4. Electricity and magnetism
Listing 10 of 62 questions
shows a high-voltage supply connected across two metal plates. When the supply is switched on, an electric field is present between the plates. Explain what is meant by an electric field . On , draw the electric field lines between the plates and indicate their direction by arrows. The metal plates are now joined by a high-resistance wire. A charge of 0.060 C passes along the wire in 30 s. Calculate the reading on the ammeter. ammeter reading = ……………………… The potential difference of the supply is re-set to 1500 V and the ammeter reading changes to 0.0080 A. Calculate the energy supplied in 10 s. Show your working. energy = ………………. A high-voltage supply metal plates + –
0625_w05_qp_3
THEORY
2005
Paper 3, Variant 0
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A charger for a cellphone (mobile phone) is marked: input: a.c. 240 V, 50 Hz, 80 mA. output: d.c. 5.3 V, 500 mA. State the component in the charger that converts a.c. to d.c., the quantity that has the value 50 Hz. Calculate the output power of the charger, output power = the energy transferred in the output circuit when the cellphone is charged for 1.5 hours. energy = In the following list, underline the quantity that is stored in the battery of the cellphone. voltage current power energy
0625_w14_qp_31
THEORY
2014
Paper 3, Variant 1
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Questions Discovered
62