Electric Circuits Answers

A 12 volt battery is connected a light bulb and draws 150mA of current. What is the electrical resistance of a light bulb. How much power does it consume. How much will it cost to operate this bulb for a month,if the cost of electricity is $0.11 per kilo watt

An air filled with 75 microfarad has a voltage of 12V. An insulator with dielectric constant of 1.00095 is inserted between the metal plates. Calculate the capacitance. What is the new voltage across the capacitor? Calculate the original charge on the capacitor. How much charge is currently on the capacitor

The parallel combination of five cells, each with electromotive force of 1.5 V and internal resistance of 0.5 Ω, is connected to an external resistance of 5.0 Ω. Find the (a) terminal voltage of the battery, and (b) terminal voltage of a cell.

Given: n=5

E= 1.5 V

r= 0.5 Ω

R= 5.0 Ω

The parallel combination of five cells, each with electromotive force of 1.5 V and internal resistance of 0.5 Ω, is connected to an external resistance of 5.0 Ω. Find the (a) total resistance of the circuit, (b) electromotive force of the battery, (c) total resistance of the circuit, and (d) current through the external circuit.

Given: n=5

E= 1.5 V

r= 0.5 Ω

R= 5.0 Ω

• Three lamps are rated 100 W, 50 W, and 10 W If each lamp is connected to a 220-V source, calculate the (a) current through each lamp and (b) resistance through each lamp.
• The resistance of a bulb is 50Ω. What is the current produced by a 24-V battery in the bulb? How many electrons does this current represent?

A copper wire is 2.50 m long and has a diameter of 2.5 mm. How much current will it draw when connected to 3.5 V source?

1.   If three identical lamps are connected in series to a 6-V battery, what is the voltage drop across each lamp?

State and explain what happens to the alpha particle on entering the region of space with the uniform electric field?

2. A TV set, a stove, a flat iron are connected in series to a 220 V line. The resistance of the TV set is 20 ohms, the stove is 50 ohms and the flat iron is 35 ohms. Find the following;

(a) total resistance

(b) the amount of current flowing in each device

(c) the voltage drop across each device

1. A point charge q = 2.00μC is located at the origin. Find the electric potential due to this charge at point x = 4.0 m.

A. 1500V C. 3500V

B. 2500V D. 4500V

2. Two point charges are arranged along the x-axis; q₁-2.0 μC is at x=0.80m, and q2-2.0 μC at x=0.80m. The net electrical potential measured at the origin due to these point charges is

A. Zero C. 22500V

B. 4500V D. 45000V