(1) A bulb is connected to a battery of p.d. 4 V and internal resistance 2.5 ohm. A steady current of 0.5 A flows through the circuit.calculate:
(i) the total energy supplied by the battery in 10 minutes;
(ii) the resistance of the bulb,and
(iii) the energy dissipated in the bulb in 10 minutes.
(2)Water in an electric kettle connected to a 220 V supply took 5 minutes to reach its boiling point.how long would it have taken if the supply voltage had fallen to 200 V ?