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Name the instrument used to control the current in an electric circuit.
Write symbol and state function of following component in an electric circuit :
cell
(a) Complete the circuit given in Fig. by inserting between the terminals A and C. an ammeter.
(b) In the diagram, mark the polarity at the terminals of ammeter and indicate clearly the direction of flow of current in the circuit when the circuit is complete.
(c) Name and state the purpose of Rh in the circuit.

State three factors on which the resistance of a wire depends. Explain how the resistance depends on the factors stated by you.
Name the physical quantitiy of which the unit is ampere
A cell of potential difference 12 V is connected to a bulb. The resistance of filament of bulb when it glows is 24Ω. Find the current drawn from the cell.
State the relation between electric current; the number of electrons moving in a circuit and time in seconds.
