Question

if you have a light bulb connected to a circuit and you increase the current, what happens to the light bulb and the power (assuming the voltage remains the same)?
a. the light bulb shines brighter and the power decreases.
b. the light bulb shines brighter and the power increases.
c. the light bulb gets dimmer and the power decreases.
d. the light bulb gets dimmer and the power increases.

Explanation:

Step1: Recall power - current - voltage relation

The power formula is $P = VI$, where $P$ is power, $V$ is voltage and $I$ is current.

Step2: Analyze effect of current increase

Given $V$ is constant, when $I$ increases, from $P = VI$, $P$ increases. More power means the light - bulb shines brighter.

Answer:

B. The light bulb shines brighter and the power increases.