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(a) Name the new and old colour codes of the wire which is connected to the switch of an appliance.

(b) Draw the diagrams of a dual control switch when the appliance is switched ON and OFF.

(c) Calculate the electrical energy consumed when a bulb of 40 W is used for 12.5 h everyday for 30 days.

Household Circuits

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Answer

(a) Live wire is connected to the switch of an appliance.

WireColour
(Old Convention)		Colour
(New Convention)
LiveRedBrown

(b) Diagrams of a dual control switch when the appliance is switched ON and OFF are shown below:

Draw the diagrams of a dual control switch when the appliance is switched ON and OFF. Physics Sample Paper Solved ICSE Class 10.

(c) Given,

Power (P) = 40 W

time (t) = 12.5 h for 30 days

As energy consumed (E) = P × t

E=40×12.5⇒E=500 WhE = 40 \times 12.5 \\[0.5em] \Rightarrow E = 500 \text { Wh}

Hence, electrical energy consumed in one day = 500 Wh

Electrical energy consumed in 30 days = ?

E = 500 x 30
= 15000 Wh
= 15 kWh

Hence, electrical energy consumed in 30 days = 15 kWh

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