Voltage is measured in units called volts and current is measured in units of amps.
The primary factors determining the effect of electricity on the body are the amount and path of the current passing through the body. Currents of less than 0.02 amp may produce sensations ranging from tingling to sharp pain. A more serious effect occurs if the current causes muscles to contract. A person touching a live wire with their outstretched hand may literally not be able to let go of the wire due to the current's effect on the muscles. Currents from 0.03 to 0.07 amp will begin to impair the ability of the person to breathe.