LESSON NO. B-15
Credit Points 4
YOU CAN MEASURE ELECTRICITY
Instruments that can detect or measure the flow of electricity have helped to make possible the wonders of electricity as we know them today.
Scientists in laboratories must have measuring devices for experiments leading to new uses of electricity. Power suppliers must have instruments that tell what the generating equipment is doing and to measure the amount of electricity being sold to users. Factories need instruments that keep tab on electrical equipment to make sure electricity is being used efficiently.
In fact, almost anywhere you find electric power at work you'll find electrical instruments—even in your home. The one you know best measures the amount of electricity used. Another, in the family car, shows whether the generator is charging the battery or if the battery is discharging.