Why? For current to flow, it must overcome the body’s resistance, which requires sufficient voltage. A car battery’s 12 volts simply aren’t strong enough to push enough current through the body.

Voltage close voltageThe potential difference across a cell, electrical supply or electrical component. It is measured in volts (V). is a measure of the difference in electrical energy between two ...

You need to know how to measure the current that flows through a component in a circuit and the voltage across it. The ammeter must be connected in series with the component – remember ...

Laura is an Assistant Editor for The Scientist. She has a background in microbiology. Her science communication work spans journalism and public engagement.