Question

select the correct answer.
elaine drew an electric circuit diagram that includes a door buzzer. but the current in the circuit is too high based on the parts she chose. which part
elaine add to lower the flow of current without changing the operation of the circuit?
a. a lightbulb
b. a motor
c. a resistor
d. a second battery

Explanation:

According to Ohm's Law \(I = \frac{V}{R}\) (where \(I\) is current, \(V\) is voltage, and \(R\) is resistance). To lower the current \(I\) without changing the operation of the circuit (i.e., keeping the voltage \(V\) related to the door buzzer's operation intact), we need to increase the resistance \(R\). A resistor is a component that provides resistance. A light - bulb and a motor change the operation of the circuit (they are loads with their own functions different from just reducing current in a non - operational - changing way), and a second battery would increase the voltage (and likely increase the current if resistance is constant).

Answer:

C. a resistor