Question

A circuit contains two resistors in series. The voltage drop across the first is 10 V. The voltage drop across the second is also 10
V. What is the voltage provided by the power supply in this circuit?

A. 10 V

B. -10 V

C. 20 V

D. -20 V

Answer 1

Hi there!

Voltage in a series can be expressed by the following:

$V_T = V_1 + V_2$

In words, the total voltage is equal to the sum of the individual voltage drops in a SERIES circuit.

We can solve for the total voltage:

$V_T = 10 + 10 = \boxed{\text{ D. 20 V}}$