1A dry cell we use has e.m.f. 1.5 V printed on it. What does this mean?
2Why is one end of a household appliance connected to the live wire and the other end to the neutral wire? What is the usual potential difference in such a circuit?
3Write three similarities between a water pump and the cell in an electric circuit.
4What is potential difference? Write its formula and unit.
5When 5 C of charge passes through a bulb, 30 J of energy changes into heat and light. Find the potential difference across the bulb.
6Why is the potential difference across the load less than the e.m.f. when current flows? Explain with an example.
7How is a voltmeter connected to measure e.m.f. and to measure p.d.?
8Write three differences between e.m.f. and p.d.