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A can be used to reduce the current in a circuit?

A resistor.


What does the variable resistor do in a circuit?

It is used to vary the voltage/current flow in a circuit.


What can be used to reduce the current a circuit?

A resistor.


What does a resistor do in an ampliflyer circuit?

what does a resistor in an ampliflyer circuit


What is need of capacitor and resistor in circuit?

because without using capacitor or resistor in a circuit,it cant be complete.Resistor is used to protect the circuit by giving a certain amount of voltage.Capacitor is used to charge and discharge purpose.


What is a function of a resistor in a fire alarm circuit?

A resistor in a sensor circuit is used as a simple way to monitor the function of the circuit. The resistor has a calibrated and known voltage drop and current while the circuit is "normal". If there is a short-circuit, or an open-circuit, the voltage and current will change and trigger the trouble alarm.


What does a pre-set resistor do in a circuit?

A preset resistor is used in some circuits to change the resistance. The preset resistor enables the circuit to be more or less sensitive thereby altering the resistance.


What device could not provide the energy for current to flow in a circuit?

a resistor


What do you call a variable resistor that is set up to alter the size of the current in a circuit?

A thermister is a device that changes resistance depending on temperature. A photo resistor changes resistance based on light. Both of these could be used with an amplifying circuit to vary current flow.


Why resistor should disconnected from the circuit when measured the value of resistor?

if not disconnected you will measure the resistance of the circuit in parallel with the resistor.


The dimmer switch in a lighting circuit controls the brightness of one or more lamps by varying the resistance in the circuit what schematic symbol could be used to represent this device?

Use the standard resistor symbol and then place an arrow across the resistor. The bottom of the arrow midpoint of the resistor and just below, the tip of the arrow (draw with an arrow head) just above the resistor. This represents the wiper of the variable resistor.


What is a device that resists the flow of electricity in a circuit?

A resistor is a device that resists the flow of electricity in a circuit. It is used to control the amount of current flowing through the circuit by providing a specific amount of resistance.