(i)

Distinction between conductors and semiconductors

Conductors are materials which allow electrons to pass through them whilst semiconductors are solid materials which electrons are held in covalent bond or materials whose conductivity lies between conductors and insulators.

(ii)

Appliances in a home which use semiconductors

1. Solar panel
2. LED Bulbs
3. Microwave
4. Central Processing Unit (CPU)
5. Washing Machines
6. Radio Sets
7. TV sets

(i)

Earthing is the transfer of electrical charges from the atmosphere directly to the earth through a wire buried in the ground. This is done to conduct excess charges/current on an appliance safely to earth or to prevent the user of the appliance from getting electric shock or to protect the circuit breaker/fuse/electrical appliances

(ii)

Sources of electric power generation

1. Battery/Cell
2. Solar
3. Wind
4. Biogas
5. Nuclear
6. Hydro/water
7. Diesel

(i)

Electrical rectification is the conversion of alternating current to direct current.

(ii)

The alternating current is made to pass through a diode, the diode allows the only one half of the alternating current which is in one direction to pass through it.