Power as a noun refers to physical power or strength. "He required a lot of force to get the ball out of the stadium." "Electrical or an electricity supply." This village was without power for a few days after the pylons fell. Human power is when people use their muscles to turn wheels or gears, which in turn move objects such as cars or trucks. Humans are able to produce up to 250 watts of power for about 20 minutes at a time. A typical household motor requires about 15 amps (120 volts) and uses approximately 1 horsepower (746 watts) for its size. Most motors are designed to work with alternating current (AC), so you will need to connect a line from a power outlet to your vehicle's negative terminal (usually marked "-"). Some small appliances such as hair dryers and vacuum cleaners are powered by direct current (DC), so you will need to carry these devices with you when you drive. Electricity is the flow of electrons through a conductor such as a copper wire. Electric circuits inside equipment use these flows to operate components such as motors, heaters, and lights. Electricity is generated by any number of different methods, but it must be able to turn a motor at some point in order to be useful. Power plants generate large amounts of electricity that are transmitted to homes and businesses across the country via electrical lines.