The fuse wire in a mains electrical plug acts as a safety device by melting and breaking the circuit if the safety current rating is exceeded.
Write down the equation that links charge flow, current, and time.
The fuse wire melts when a charge of 1.84 C1.84\text{ C}1.84 C flows through the fuse in 0.80 s0.80\text{ s}0.80 s. Calculate the current at which the fuse wire melts.
The mass of the fuse wire is 0.0015 kg0.0015\text{ kg}0.0015 kg. The specific latent heat of fusion of the metal is 210 000 J/kg210\,000\text{ J/kg}210000 J/kg. Calculate the energy needed to melt this fuse wire using the equation:
E=m×LE = m \times LE=m×L