1As more salt is dissolved in the water, what change is seen in the brightness of the bulb?
2Use sugar instead of salt and observe. Does the bulb light?
3If 0.2 C of charge flows through a conducting wire in 5 s, calculate the current in the wire.
4What is electric current? Write its formula and SI unit.
5What is meant by a current of 1 ampere?
6Why are metals good conductors of electricity?
7How does the direction of current differ from the direction in which electrons flow?
8How is an ammeter connected in a circuit, and why?
9A heater and a light bulb run for the same time. Which converts more electrical energy, and why is there a difference?
10A current of 0.5 A flows in a wire for 2 minutes. How much charge flows?
11Change 250 mA into amperes, and 0.3 A into milliamperes.