DC Circuits

If one of the resistors in a parallel circuit is removed, what happens to the total resistance?

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.

A certain copper wire has a resistance of 0.5 ohms when the length is 10m. What is the diameter in mils?

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?

A 16-ohm resistor is connected in series with parallel combination of three resistors, R and 48 ohms. Determine R if the power consumed by the parallel connected resistor is equal to the power consumed by the 16-ohm resistor.

The power consumed by a heating element made of copper wire is 250 W at 220 V and 30 °C. What is the power consumed by the same element at 220 V and 100 °C? The temperature coefficient of the element at 30 °C is 0.004 per °C.

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

In a parallel circuit the potential difference across the resistance

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 \(R_2\)?

The condition in Ohm’s Law is that

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?