(a) State Joule’s law of heating.
(a) State Joule’s law of heating.
(b) A length of nichrome wire and a length of copper wire, each of identical length and kept at the same temperature, carry the same steady current. Explain why the nichrome wire becomes much hotter than the copper wire.
(c) Two wires have resistances R1 and R2 (R1>R2). The same current I flows through each for the same time t. Explain, with reasons, which wire dissipates more electrical energy and by what factor.