A charge of +3.1 × 10-16 coulombs is moved between two points, resulting in a potential difference of +15 volts. What is the magnitude of the work done on that charge?

Explanation:

The work done is the product of charge and potential

Thus work = 3.1 x 10⁻¹⁶ x 15 =  4.65 x 10⁻¹⁵ J

when a device is used in a circuit in which the voltage is 81 v, the current flowing through the device is 3 a. what is the resistance of the device?

a. 27 ω

b. 40.5 a

c. 243 ω

d. 243 a

the correct answer is a. 27