Janet installed a dimmer on the lights in her bedroom. She slid the dimmer switch up, causing the resistance in the circuit to decrease. Assuming the voltage is constant, what effect will Janet’s actions have on the circuit? The voltage will increase from 120 to 240 volts. The lights will brighten. The current will decrease. The current will increase. The lights will dim.
Question
Janet installed a dimmer on the lights in her bedroom. She slid the dimmer switch up, causing the resistance in the circuit to decrease. Assuming the voltage is constant, what effect will Janet’s actions have on the circuit? The voltage will increase from 120 to 240 volts. The lights will brighten. The current will decrease. The current will increase. The lights will dim.
Solution
Janet's actions will cause the lights to brighten and the current to increase. This is because, according to Ohm's law, the current in a circuit is directly proportional to the voltage and inversely proportional to the resistance. So, if the resistance decreases (as it does when Janet slides the dimmer switch up), the current will increase, assuming the voltage remains constant. An increase in current will cause the lights to brighten. The voltage will not increase from 120 to 240 volts because the question assumes the voltage is constant. The lights will not dim because an increase in current causes an increase in brightness.
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