Question

Janet installed a dimmer on the lights in her bedroom. She slid the dimmer switch, causing the resistance in the circuit to decrease. Assuming the voltage is constant, what affect will Janet’s actions have on the circuit?

Answer 1

Answer:

the current increases, and the light will shine brighter

Explanation:

The relationship between voltage (V), current (I) and resistance (R) in a circuit is given by Ohm's law:

$V=RI$

Let's apply this law to the circuit described in the problem. In this case, the voltage is assumed to be constant, while the resistance is decreased. We can re-write the Ohm's law expliciting the current:

$I=\frac{V}{R}$

We see that the current (I) is inversely proportional to the resistance (R), so if the resistance decreases, then the current increases.

Therefore, in this case the current will increase, and the light will shine brighter.

Answer 2

Answer:

b and d

Explanation: