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An electric heater operating at 220 volt...

An electric heater operating at 220 volts boils 5 litre of water in 5 minutes. If it is used on 110 volts, it will boil the same amount of water in

A

5

B

20

C

10

D

2.5

Text Solution

Verified by Experts

The correct Answer is:
B
W = Power `xx` time `= (V^(2) t)/( R)`
R is the same.
`therefore V^(2) t`= constant . `V_(1)^(2) t_(1) = V_(2)^(2) t_(2)`
`220^(2) xx 5 =110^(2) t_(2)`
`therefore t_(2) = 20` min.
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