MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY
Digital voltmeter. This device is used to measure voltage. Voltage is the potential difference, also called the electromotive force, measured between two points in a flow of electric current. It can be thought of as a measure of the force of the current, and is closely related to the resistance of the circuit and the amount of current. The relative power of batteries is measured in terms of their voltage. This is a digital voltmeter, displaying the voltage as digits on an LCD (liquid crystal display) screen, rather than by use of a moving needle on a dial (analogue). The voltmeter is connected to the circuit at the points labelled by the switch on the front. This model, from ipc, is designed to measure voltages of up to 2 volts.
Model release not required. Property release not required.