WILL FAN AND GIVE MEDAL
In the formula below, represents the electric power of a light bulb measured in watts, is the voltage, and is the current in amperes.

A 90-watt light bulb has a current of 6 amperes and a voltage of 15 volts.

If the voltage of the 90-watt light bulb doubles, what will happen to the current?
A. The current will decrease by half.

B. The current will double.

C. The current will decrease by one-fourth.

D. The current will stay the same.

Question

WILL FAN AND GIVE MEDAL
In the formula below, represents the electric power of a light bulb measured in watts, is the voltage, and is the current in amperes.


A 90-watt light bulb has a current of 6 amperes and a voltage of 15 volts.

If the voltage of the 90-watt light bulb doubles, what will happen to the current?
A. The current will decrease by half.

B. The current will double.

C. The current will decrease by one-fourth.

D. The current will stay the same.

johnweldon1993 · Answer

Okay since we know that power is

$$\large P = VI$$
we had
$$\large P = 15*6 = 90W$$

Now, if we double the voltage (15V) of the light bulb, we will have

$$\large P = VI$$
$$\large 90 = 30*A$$

what does A equal?

anonymous · Answer

3?

johnweldon1993 · Answer

Right

So if the Current went from 6 amps to 3 amps....

anonymous · Answer

The current will decrease by half so the answer will be A. Thanks

johnweldon1993 · Answer

No problem!

anonymous · Answer

how come i can't fan you?