# Current, Potential Difference and Resistance Questions

Not what you're looking for?

1. If a lamp is measured to have a resistance of 45 ohm when it operates at a power of 80 W, what is the current in the lamp?

A. 2.10 A

B. 1.3 A

C. 0.91 A

D. 0.83 A

2. If a lamp has a resistance of 120 ohm when it operates at a power of 1.00 x 10^2 W, what is the potential difference across the lamp?

a. 110 V

b. 120 V

c. 130 V

d. 220 V

3. An electric toaster requires 1100 W at 110 V. What is the resistance of the heating coil?

a. 7.5 ohm

b. 9.0 ohm

c. 1.0 x 10^1 ohm

d. 11 ohm

Please show the work done, formulas used and the answer. Thank you!

##### Purchase this Solution

##### Solution Summary

Ohm's Law = V = I*R

P = V*I = I^2*R = V^2/R

I = Current, R = Resistance, V = Voltage, P = Power

##### Solution Preview

I = Current, R = Resistance, V = Voltage, P = Power

Ohm's Law = V = I*R

...

##### Purchase this Solution

##### Free BrainMass Quizzes

##### Classical Mechanics

This quiz is designed to test and improve your knowledge on Classical Mechanics.

##### Intro to the Physics Waves

Some short-answer questions involving the basic vocabulary of string, sound, and water waves.

##### Introduction to Nanotechnology/Nanomaterials

This quiz is for any area of science. Test yourself to see what knowledge of nanotechnology you have. This content will also make you familiar with basic concepts of nanotechnology.

##### Variables in Science Experiments

How well do you understand variables? Test your knowledge of independent (manipulated), dependent (responding), and controlled variables with this 10 question quiz.

##### Basic Physics

This quiz will test your knowledge about basic Physics.