Linda Grass, age 10, Phoenix, Arizona,

How much is a volt?

Voltage is the pressure which makes electric current flow through a wire circuit, one volt is the standard unit of measurement for this electrical pressure. It was decided upon at an International Electrical Congress in 1893. At another such conference in 1908s the voltage unit ‑,.vas further clarified with set units for the ampere and the ohm,

The ohm is the unit of resistance in the electric circuit, the resistance which opposes the electrical pressure of the volt. The ampere is the electrical power available for use in the circuit, The volt is the standard unit of electrical pressure needed to produce one ampere while opposed by one ohm. An ampere of current is needed to keep two reading lights burning brightly.