(a(i))[2]
A relay has been attached to the output of the op-amp circuit so that a lamp can be switched on or off. Finish Fig. 9.1 by showing how the relay is connected into the circuit.
(a(ii))[2]
State and explain whether the op-amp output must be positive or negative for the lamp to turn on.
(b(i))[1]
State the device in Fig. 9.1 that could be used so that the circuit shows a change in the bending of a rod.
(b(ii))[1]
State the device in Fig. 9.1 that could be used so that the circuit shows a change in the level of daylight to switch on a street light.
(a)
A relay is attached to the output of the op-amp circuit so that a lamp can be switched on or off.
(b)
State the device in Fig. 9.1 that could be used so that the circuit shows a change in: