1. The problem statement, all variables and given/known data Describe how the earth wire and fuse in an appliance with a metal casing protects the user from shocks if a short occurs to the casing. 2. Relevant equations 3. The attempt at a solution I said that the earth wire provides a low impedance path to ground. As electricity flows via this low impedance path this then causes a large current draw which then causes the fuse wire to heat up and melt and breaks the circuit. However my teacher said that I should have used the word resistance instead of impedance in my answer? A.