Electronics Information – Test 3

Heating of an electric current: I through a conductor of resistance, R for a time, t is given by H = I²Rt. The equation is the Joule’s equation of electrical heating.

Micro-ohmmeters make low resistance measurements. Megohmmeters measure large amounts of resistance.

Reduces electric current, for example, to limit current passing through.

 Protects your electronics from power surges from your electrical system.

Copper used in building wire has 100% conductivity IACS or better.

The ohm symbol, Ω, is the SI derived unit of electrical resistance, named for physicist Georg Simon Ohm.

The capacitor is a device with two terminals that stores electric energy

Fuses keep components from overloading with too much current.

The advent of wire gauges rationalized selection of wire for a particular purpose.

The amount of power wasted in heat is a function of efficiency. Any power that is not useful, such as signal power, is wasted in heat. In order to determine the amount of wasted power, the total input power must first be determined by using the power formula

Electrical cells are known as an "electrical power supply" capable of converting chemical energy into electrical potential energy.

1 ampere is equal to 1000 milliamps, or 1 amps.

Hot wires carry power from the electric service panel to a destination, like an outlet

The process of doping creates doped or extrinsic semiconductors.

The neutral is white, the hot single phase wires are black , and a second active can be black.

Divide the watt by the voltage to find the amps.For example, a 60 watt bulb on a 120 v system would take ½ amp