Assertion (A) : Current flows from body at higher potential to a body at lower potential.

Reason (R) : The direction of flow of electrons is from low potential body to a body at a higher potential.

1. both A and R are true and R is the correct explanation of A
2. both A and R are true and R is not the correct explanation of A
3. assertion is false but reason is true
4. assertion is true but reason is false

Assertion (A) : Longer wires have greater resistance and the smaller wires have lesser resistance.

Reason (R) : Resistance of a wire increases with increase in temperature.

1. both A and R are true and R is the correct explanation of A
2. both A and R are true and R is not the correct explanation of A
3. assertion is false but reason is true
4. assertion is true but reason is false

Which of the following device is most efficient for lighting purpose:
LED, CFL, Fluorescent tube light, Electric bulb.

State two ways to save energy.