1)Explain how a diode could be used to convert a. c. to d. c., and suggest one disadvantage of this.

2) Some energy is always transferred to the surroundings when a current flows through a wire.

a) How is this energy transferred?

b) Is this energy always wasted energy? Explain your answer.

3) You can induce an electric current in a wire by moving a magnet relative to the coil.

A) Describe two different ways in which you can increase the size of the induced current.

B) Describe how you can reverse the direction of the induced current.