Mathematics

Problem

A kitchen circuit is protected by a

15\,\text{A}

MCB. Three appliances are ON simultaneously: a kettle

1500\,\text{W}

, a room heater

1000\,\text{W}

and a toaster

500\,\text{W}

, all designed for

220\,\text{V}

. The user now wishes to run an additional mixer-grinder rated

1000\,\text{W}

on the same circuit. Which action below will prevent the MCB from tripping? a) Plug the mixer-grinder into a different socket on the same circuit using a multi-plug b) Switch off the room heater before switching on the mixer-grinder c) Replace the existing

15\,\text{A}

MCB with a

30\,\text{A}

MCB d) Switch off only the toaster before switching on the mixer-grinder

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