The diagram shows a circuit tester. Which objects will cause the light bulb to go off when placed in the circuit tester?
(a) Pencil lead (graphite)
(b) Steel ball
(c) Paper
(d) Aluminium foil
The diagram shows a circuit tester. Which objects will cause the light bulb to go off when placed in the circuit tester?
(a) Pencil lead (graphite)
(b) Steel ball
(c) Paper
(d) Aluminium foil