Competency #8

Answer and Explanation

Electric current is: The correct answer is D.

  1. Voltage flows through a circuit.

    Charge flows through a circuit. This flow of charge is called current.
  2. Resistance is established across a circuit.

    Resistance is a property of the wires or other parts of a circuit. Each object in a circuit has a certain resistance. Resistance is the extent to which a material opposes the flow of charge.

    A voltage is established across a circuit.
  3. Current causes voltage.

    Current, the flow of charge, does not cause voltage in a circuit.
  4. Voltage causes current.

    This is the correct answer. It is the voltage, or potential difference, that causes the flow of charge (current) in a circuit.

    Electrons flowing through a wire can be compared to water flowing through a pipe. It is the difference in pressure that causes the water to flow through the pipe. The greater the pressure difference from one end to the other, the greater the flow rate of water coming out of the pipe. In this example, water pressure is analogous to voltage and the flow rate of water is analogous to current.
  5. None of the above.

MainMore help

© 2008 Anne Arundel Community College