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Oak National Academy
12 questions
Which of the following are correct equations that include power?
The potential difference across a lamp is 230 V and the current through the lamp is 0.20 A. The energy transferred by the lamp in one second is ___ J.
Which of the following equations correctly relates current, resistance and potential difference for an electrical component?
All electrical appliances, such as laptops and vacuum cleaners, transfer energy into the surroundings by heating. This process is called …
Which of the following statements about efficiency are correct?
Which of the following statements describes the generator effect?
Starting with the power station, sort the following parts of the National Grid in the order in which they are connected together.
A 400 kV transmission line delivers 400 MW of power. The current through the transmission line is ___ A.
A transmission line has a resistance of 3.0 Ω per 100 km and a current of 1000 A through it. How much energy is dissipated by 250 km of this transmission line each second?
A transformer, with 100% efficiency, increases voltage from 10 kV to 40 kV. If the current through the primary coil is 60 A, the current through the secondary coil is ___ A.
Which of the following statements about the current and voltage of transmission lines are correct?
A transformer in a mobile phone charger decreases voltage from 230 V to 10 V. The current in the secondary coil is 2.0 A. If the transformer is 100% efficient, what is the current in the primary coil?
