An immersion heater is a small appliance used to heat a cup of water for tea by passing current through a resistor.
If the voltage applied to the appliance is doubled, by how much will the time required to heat the water change?
It will double
It will be quartered
It will be halved
It will triple
It will stay the same
Is making this change a good idea?
Yes, since it would take a much shorter time to heat the water.
No, since the device is rated for a specific power and could possibly burn up.
It does not matter since it does not affect the time.
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