C: iron
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A current is produced when a wire is moved between two magnets as shown. Which device uses this effect?
Why is a transformer used to connect a generator in a power station to a long-distance transmission line?
A teacher sticks a magnet to the top surface of a match-box cover. The bottom surface is placed in a small tray of ir…
Energy is released in some power stations and in the Sun by either nuclear fission or nuclear fusion. Which type of n…
The diagram shows a girl lifting a box of weight 50 N from a low shelf to a high shelf. How much work is done on the …
The diagram shows the energy transfer through a machine. The machine is 50% efficient. Which equation is correct?