| Mercury-type and commutator-type watt-hour meters measure power in direct-current circuits. |
| With the cost of the Kyoto Protocol looming large on the horizon, every watt-hour we save represents fewer carbon-credits we need to purchase. |
| A watt-hour refers to the amount of energy that can be stored or released in a given hour. |
| Although there are several different types of watt-hour meters, each consists essentially of a small electric motor and a counter. |
| The energy density is the amount of watt-hour that the battery may produce by unit weight or unit volume. |
| Every watt-hour you can save is heat that the customer doesn't have to deal with. |
