Question

The circuit below shows some of the circuitry in a small toy robot. When the circuit is on the robot moves its arms, the motor, and blink the light on its head, the lightbulb.
A. How much current Is in the circuit when these things are happening? Hint defined the total resistance of the circuit add the two resistances together.


B. What is the voltage between point P and the battery?

Answer 1

Answer:

A. 0.25 A

B. 4.5 V

Explanation:

A. The total resistance of resistances in series is:

R = R₁ + R₂

R = 18 Ω + 18 Ω

R = 36 Ω

Ohm's law:

V = IR

9 V = I (36 Ω)

I = 0.25 A

B. The voltage across the bulb (between P and the battery) can be found with Ohm's law.

V = IR

V = (0.25 A) (18 Ω)

V = 4.5 V