If a current of flows in a copper wire with a cross-sectional area of and a length of approximately how much electrical energy is transferred to thermal energy in
The resistivity of copper is
Suppose that energy is dissipated at the rate of in a resistor which is connected between the terminals of a battery. If the same resistor is connected between the terminals of a battery, at what rate is energy dissipated?
James dries his hair with a hair dryer every morning. The dryer uses of power and the current supplied is What is the resistance of the dryer?
A Nichrome wire that has a cross sectional area of is connected to a potential difference of If the wire dissipates what is its approximate length?
Nichrome has a resistivity of
Consider a certain length of uniform heating wire which has a resistance of At what rate is energy dissipated when (a) a potential difference of is applied across the full length of the wire, and (b) the wire is cut in half and the same potential difference as in (a) is applied across the length of each half?