A series circuit has two 5.0-ohm resistors and a power source of 9.0 volts. How will the current be affected and what will it be if another resistor (with a resistance of 7.5 ohms) is added to the circuit?

A. increase; 0.51 amps

B. increase; 0.72 amps

C. increase; 3.6 amps

D. decrease; 0.51 amps

E. decrease; 0.72 amps

Question

Chemistry

Bentley Frey

Today, 15:11

A series circuit has two 5.0-ohm resistors and a power source of 9.0 volts. How will the current be affected and what will it be if another resistor (with a resistance of 7.5 ohms) is added to the circuit?

A. increase; 0.51 amps

B. increase; 0.72 amps

C. increase; 3.6 amps

D. decrease; 0.51 amps

E. decrease; 0.72 amps

+4

Answers (1)

Know the Answer?

Francesca Morgan · Answer 1

The formula for solving current given with resistance and power source or voltage is shown below:

I = V/R

When two 5 ohms resistors are in series, we have:

I = 9 volts / (5+5 ohms)

I = 0.9 amperes

When it is being added with another 7.5 resistors, we have:

I = 9 volts / (5+5+7.5 ohms)

I = 0.529 ampere

The answer to the question is the letter "D. decrease; 0.51 amps".