DC Circuits

Four 100 W, 100 V heaters are connected in series across a 600 volt circuit. The total heat given off by the four heaters will be _ watts.

If a 440 V heater is used on 110 V supply, heat produced by it will be as _ much.

Three 90 mH inductors are connected in parallel. Find the total inductance.

Two equal resistors when connected in series across a supply draw a total of 20 watts. What is the total power drawn when the two resistors are connected in parallel across the same supply?

If there are eleven resistors of 33kΩ each in parallel, what is the total resistance?

Suppose a cell of 1.5 V delivers 100 mA for 7 hours and 20 minutes, and then it is replaced. How much energy is supplied during this time?

A lead storage battery is rated at 12 volts. If the internal resistance is 0.01 ohm, what is the maximum power that can be delivered to the load?

Two 30 Ω resistances are connected in series. When an unknown resistance R is connected in parallel with one, the new total resistance is 40 Ω What is the value of R? 5Ω

Four resistances of 10, 20, 30 and 40 ohms are connected in parallel. What is the equivalent resistance?

The potential at the terminals of the battery falls from 9 v on open circuit to 6 volts when a resistor of 10 ohms is connected across its terminals. What is the internal resistance of the battery?

An electric heater takes 1.2 kWhr in 30 minutes at 120V. What is the current input to the heater?

Two resistors \(R_1\) and \(R_2\) are connected in parallel. \(R_1\) is twice \(R_2\). If the current in \(R_1\) is I, what is the current in \(R_2\)?

A bulb having a rating of 220 volts, 75 watts is to be connected to a 110 volts source. What power will it draw if connected across 110 volts source?

A load of 10 ohms was connected to a 12-volt battery. The current drawn was 1.18 amperes. What is the internal resistance of the battery?

A lead storage battery is rated at 12 volts. If the internal resistance is 0.01 Ω, what is the maximum power that can be delivered to the load?

A series circuit consists of three resistors R1, R2 and R3 which are connected to a 240 v source. If the voltage drop across R1 is 60 v when the current is 4 A and R2= 1.5 R3, what is the ohmic resistance R3?

A 36 Ω resistor is connected in parallel with an unknown resistor R. Their combination is then connected in series with a 12 Ω resistor. Find the value of R such that the power drawn by the parallel combination of 36 Ω and R is equal to the power in the 12 Ω resistor.

A 120-volt battery having an internal resistance of 0.5 Ω is connected through a line resistance of 9.5 Ω to a variable load resistor. What maximum power will the battery deliver to the load resistor?

A lead storage battery is rated at 12 volts. If the internal resistance is 0.01 Ω, what is the maximum power that can be delivered to the load?

Two 100-watt lamps connected in series across a 220-v line draw 1 A. What is the total power consumed?