Final answer:
Voltage in circuits has characteristics such as being measured in volts, pushing free electrons around the circuit, and causing current to flow.
Step-by-step explanation:
The characteristics of voltage in circuits include:
- It is measured in volts. Voltage is the potential difference across the terminals of a battery and is measured in volts (V).
- It pushes free electrons around the circuit. When a voltage source is connected to a conductor, it applies a potential difference that creates an electric field, exerting force on charges and causing current.
- It causes current to flow. The potential difference created by voltage sources drives the flow of electric current in a circuit.
Therefore, the correct answer is d. all of the choices.