A: capacitor
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A student tests the circuit of a press-button telephone with a lamp and a battery. Which single switch can be pressed…
The metal case of an electric heater is earthed. The plug to the heater contains a 5 A fuse. There is a current of 4 …
A cathode-ray oscilloscope is connected to an a.c. generator. A wave is seen on the screen of the oscilloscope. The s…
Sound travels at different speeds in air, water and steel. For these materials, which row is correct?
Which list contains an example of a non-magnetic material, a magnetic material and a magnetised material?
The diagram shows three pairs of parallel wires with the currents in the directions shown. For each pair of wires, wh…