Immersion Heater#

An immersion heater is a small appliance used to heat a cup of water for tea by passing current through a resistor.

Part 1#

If the voltage applied to the appliance is doubled, by how much will the time required to heat the water change?

Answer Section#

  • It will double

  • It will be quartered

  • It will be halved

  • It will triple

  • It will stay the same

Part 2#

Is making this change a good idea?

Answer Section#

  • 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.


Problem is licensed under the CC-BY-NC-SA 4.0 license.
The Creative Commons 4.0 license requiring attribution-BY, non-commercial-NC, and share-alike-SA license.