Question

The power circuit is used for .............. and the lighting circuit is used for ................. .
(A) devices which draw small current , heavy current
(B) devices which draw heavy current ,small current
(C) devices which do not draw any current , which draw some current
(D) devices which draw heavy current, which do not draw any current

Answer 1

Hint
A power circuit is defined as any circuit used to carry electricity that operates a load. This may seem like a simplistic definition but it is important to distinguish power circuits from control circuits since they serve different purposes.

Complete step by step answer
Most lighting and receptacle outlet circuits in a house are power circuits since they only provide power to devices when the devices operate, and the circuit control is part of the power circuit. There are two separate circuits in a house, the lighting circuit with a 5A fuse and the power circuit with a 15A fuse.The lighting circuit is used for running low power rating devices and the power circuit is used for running high power devices.

Note
Unlike the ring power circuit, the lighting circuit does not form a loop returning to the consumer unit. The lighting cable is routed from the consumer unit to a series of lighting points for ceiling roses or wall light fittings. The power to each lamp is connected via a wall or ceiling mounted switch.