The element of an electric heater is in the form of a coil. Once it is heated by dc voltage and then by ac voltage of equal potential difference. Will the production of heat in both cases be same of different?

Two heater wires, made of the same material and having the same length and the same radius, are first connected in series and then in parallel to a constant potential difference. If the rate of heat produced in the two cases are Hs and Hp respectively then (Hs)/(Hp) will be

One kilogram of graphite is burnt in a closed vessel.The same amount of graphite is burnt in an open vessel.Will the heat evolved in two cases be same or different?

An electric heater is connected to DC and AC sources of equal voltage turn by turn. In which case (AC or DC) the rate of heat production will be more ?

In L-R circuit, the a.c. source has voltage 220 volt. If the potential difference across the inductance is 176 volt, the p.d. across the resistance will be

A 500W electric heater is designed to work with a 200 V line. If the voltage of the line drops to 160V, then what will be the percentage loss of the heat developed?

A 500W electric heater is designed to work with a 200 V line. If the voltage of the line drops to 160V, then what will be the percentage loss of the heat developed?

Two heating wires of equal length are first con nected in series and then in parallel to a constant voltage source. The rate of heat produced in the two cases is

In a LR circuit, the AC source has voltage 220V and potential difference across the resistor is 176V .The power factor of the circuit is