Question

Circuits often include a _____________ to control the flow of current.

Answer 1

Answer:

The three most common protective devices are fuses, circuit breakers, and surge protectors.

Answer 2

Answer:

To control the flow of current, circuits often include a rheostat.

Explanation:

• An adjustable resistor is called a rheostat.
• In a rheostat, a resistive wire is wrapped so that a toroid coil is formed with a wiper. This slides along the coil's surface.

In a rheostat, the resistance of the circuit is varied. So, without varying the voltage of the battery, the current in the circuit is maintained or controlled by varying the resistance. This is done by sliding the wiper along the coil's surface.

Hence, to control the flow of current, circuits often include a rheostat.