Connect a variable DC power supply to an electronic breadboard.
Build a simple circuit connecting a 2000-ohm resistor in series with a red LED, a digital multimeter and the variable power supply. The red LED will act as a test lamp to show that current is flowing.
Turn the multimeter selector knob to a milliamperes setting. Turn the power supply on and adjust to 12 volts output. Observe the multimeter current reading. It will read very close to 6 milliamps. It will not be exactly 6 milliamps because the hookup wire and LED add some resistance to the circuit.
Increase the voltage output from the power supply to 24 volts. Observe the change in the multimeter current reading. It will read close to 12 milliamps. An increase in the voltage results in an increase in the amperes.
Turn off the voltage supply. Replace the 2000-ohm resistor with a 1000-ohm resistor. Turn on the voltage supply and adjust the voltage output to 24 volts. Observe the multimeter current reading. It will read 24 milliamps. A decrease in the resistance results in an increase in the amperes. Therefore, by increasing the voltage in a circuit or by decreasing the resistance in a circuit, the amperes in a circuit will be increased.