Question 2

1. Define:

(i)         thermionic emission;
(ii)        photoelectric emission.
(b)  Fig. 1 is a simple d.c. circuit.

The resistor represented in the circuit is a colour coded resistor.
Calculate the:
(i)         maximum resistance of the resistor;
(ii)        minimum resistance of the resistor;
(iii)       maximum value of current through the circuit;
(iv)       minimum value of current through the circuit.