DC Circuit Quiz (4GR)

Four resistors are connected in the circuit as shown. State the two terminals where the total resistance of the combination is the (a) minimum, (b) maximum. Calculate the total resistance in (a) and (b).

Answer explanation

Three identical light bulbs are connected in parallel to a battery supply of emf, E. If the filament of one of the bulbs breaks, state and explain what happens to each of the following: (a) ammeter reading, (b) brightness of the remaining two bulbs.

Answer explanation

(a) Reading on the ammeter will be lower since total resistance increases and current from battery decreases.

(b) Brightness of bulbs remain the same since potential difference and resistance of each bulb is unchanged. Using V = IR, current through each bulb is unchanged.

Answer explanation

Answer explanation

You are now given a wire. Sketch on the diagram where you will connect it so that current from battery reads 1.67A. Show your working.

Answer explanation