A hot plate of an electric oven connected to a 220 V line has two resistance coils A and B, each of 24 Omega` resistance, which may be used separately, in series, or in parallel. What are the currents in the three cases?

Three equal resistance each of 3Omega are in series and connected to cell of internal resistance one ohm. If three resistances are parallel and connected to the same cell. Then the ratio of the respective currents through the electric circuits in the two cases is

An electric iron consumes energy at a rate of 840 W when heating is at the maximum rate and 360 W when the heating is at the minimum. The voltage is 220 V. What are the current and the resistance in each case?

A coil of inductance 8.4 mH and resistance 6 Omega are connected to a 12 V battery. At what time the current in the coil will be 1.0 A ?

A technician has only two resistance coils. By using them singly in series or in parallel, he is able to obtain the resistance 1.5, 2, 6 and 8 ohms. The resistance of two coils are

A 100 mu F capacitor in series with a 40 Omega resistance is connected to a 110V. 60 Hz supply. What is the maximum current in the circuit ?

An electric lamp of 100 Omega , a toaster of resistance 500 Omega , and a water filter of resistance 500 Ω are connected in parallel to a 220 V source. What is the resistance of an electric iron connected to the same source that takes as much current as all three appliances, and what is the current through it?

(a) How much current will an electric bulb draw from a 220 V source, if the resistance of the bulb filament is 1200 Omega ? (b) How much current will an electric heater coil draw from a 220 V source, if the resistance of the heater coil is 100 Omega ?