How is the "current coil" connected in a watt-hour meter?

The current coil in a watt-hour meter is connected in series with the load. This configuration allows the meter to measure the current flowing through the circuit accurately. When measuring energy consumption, it's essential that the current coil experiences the same current as the load, enabling the watt-hour meter to calculate the total energy used over time.

By being in series, the current coil can effectively determine the power usage by interacting with the potential coil, which is typically connected in parallel to the supply voltage. This arrangement ensures that both voltage and current are accounted for in the measurement of power. As a result, the watt-hour meter can provide precise readings of electricity consumption in kilowatt-hours.

The other options do not apply here, as the nature of energy measurement requires the current coil to be in series to ensure the meter accurately reflects the current flowing through the load.