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Q4. The alarm circuit in Fig shows a silicon transistor, a relay and a klaxon.

(a) With reference to current flow, describe the operation of the circuit when S is closed.

(b) State EACH of the following:

(i) the type of transistor;

(ii) ONE marine application for this circuit.

(c) Sis closed and VeE = -0.7 V, VcE = -0.3 V.

Calculate EACH of the following:

(i) the power dissipated by the relay coil;

(ii) the current gain of the transistor;

(iii) the power supplied to the circuit.