Electrical Science Check

1. Demand charges on a business electricity bill are based on:

The number of separate circuits on the distribution boardThe declared voltage of the incoming supplyThe total kWh consumed across the whole monthThe highest power draw in any half-hour interval

2. An energy meter typically measures:

Voltage only, with current inferred from the tariffCurrent only, since voltage is fixed by the networkReal power and energy, and often power factor and reactive powerTemperature-corrected energy for the heating fuels alone, with electricity read separately

3. Which is a practical step to reduce electrical demand charges?

Increase the declared supply capacity with the network operatorSwitch every load off simultaneously at the end of each dayReplace three-phase equipment with single-phase equivalentsStagger the start-ups of large equipment across the morning

Knowledge check