How to Regulate DC Power With Resistors

Resistors can be used to regulate voltage and current in a DC circuit.
••• Comstock/Comstock/Getty Images

Resistors are electrical devices that restrict the flow of electrical current through a circuit. Resistors can be used for several functions, such as voltage isolation or setting a limit for how much current flows through the circuit. Using resistors for either function allows the power of the circuit to be regulated.

    Cut two pieces of electrical wire and strip 1/2 inch of insulation from the ends of each wire segment.

    Twist one of the leads from one of the resistors together with one end of the first wire. Attach the loose end of the first wire to the positive battery terminal. Note that you only need one resistor for this circuit.

    Attach one end of the second wire to the negative battery terminal.

    Turn on the digital multimeter and set the measurement scale to “DC Amps.” Place the black probe on the loose end of the first wire. Place the red probe on the unoccupied resistor lead. Read the multimeter display; the electrical current flowing through the circuit will be about six milliamps. By adding one kiloohm of resistance to the circuit, the resistor has limited the circuit current to six milliamps.

    Things You'll Need

    • 2 1-kiloohm resistors
    • 6-volt battery
    • Electrical wire
    • Electrical pliers
    • Digital multimeter

Related Articles

How to Make a DC Voltage Regulator
How to Change Electrical Amps to Watts
How to Use a Multimeter for the Beginner
How to Calculate 30 KW to Amps
How to Convert Watts to Volts
How to Convert 12 Volt Alternator to 120 Volts
How to Test a Blower Resistor
How to Calculate Load Current
How to Read Amps on an Analog Multimeter
How to Use a 9-Volt Battery to Power LEDs
How to Reduce 12 Volt to 6 Volt
How to Wire a Battery in Series
How to Convert 12 Volt to 6 Volt
How to Make a Simple Circuit
How to Figure kW Rating of a 3 Phase Electric Motor
How to Convert a 9V Battery to 3.3V DC
How to Calculate Millivolts to Amps
How to Calculate KVA to MVA
How to Test DC Motors
How to Reduce Voltage on 12 Volt System to 4 Volt