What is the source of energy in a circuit?

What is the source of energy in a circuit?

• A. The source of energy in a circuit.
• B. A device that measures current.
• C. A resistor that dissipates heat.
• D. A switch that controls flow.

Answer: (A)

The energy in a circuit comes from the power source, such as a battery or generator. This source provides the energy by creating a potential difference that pushes charges around the circuit. As charges move through the components, that electrical energy is transferred and transformed (for example into light, sound, or heat). A device that measures current doesn’t supply energy; it mainly measures and may add a tiny resistance. A resistor dissipates some of the electrical energy as heat, but it does not add energy to the circuit—its job is to use some of the energy provided by the source. A switch simply controls whether the circuit is complete or open, so it doesn’t supply energy either. So the source of energy in a circuit is the power source (battery, generator, etc.).

The energy in a circuit comes from the power source, such as a battery or generator. This source provides the energy by creating a potential difference that pushes charges around the circuit. As charges move through the components, that electrical energy is transferred and transformed (for example into light, sound, or heat).

A device that measures current doesn’t supply energy; it mainly measures and may add a tiny resistance. A resistor dissipates some of the electrical energy as heat, but it does not add energy to the circuit—its job is to use some of the energy provided by the source. A switch simply controls whether the circuit is complete or open, so it doesn’t supply energy either.

So the source of energy in a circuit is the power source (battery, generator, etc.).