Electricity and Alternating Current Crossword Puzzle

QUESTIONS LIST: alternating : type of current that changes direction periodically, ohm : unit of measurement for electrical resistance, resistor : device used to control the flow of current, direct : type of current that does not change direction periodically, hertz : frequency measured in, watt : units for power, national grid : system of pylons and cables that carry electricity to homes, transformer : used to step up or down the voltage, amp : unit for current, voltmeter : measures voltage, oscilloscope : device used to display alternating and direct current