The output of an a.c. generator is connected to a lamp. The coil of the generator is rotated at a constant rate which makes the lamp flash twice every second. The coil is then rotated at half the rate of rotation. What happens to the maximum brightness of the lamp and how many times does the lamp flash every second?

A simple d.c. motor consists of a coil that rotates between the poles of a permanent magnet. The turning effect is in…

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?

An airtight container holds a fixed mass of gas. Its pressure and volume are measured on four occasions when the temp…

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 …