5.2 Measuring Electricity Flashcards
Measuring electricity is essentially finding out _____, ______, and ______ the electricity flows through a conductor.
how much, how fast, and with what force
Amperage (I)
The rate of the flow of current
What is the unit used to measure current?
Ampere or amp (A)
The equipment where electricity enters a house is usually rated at how many amps?
100 A or 200 A
Electromotive force (E or emf)
The pressure created by electrical potential that moves electrons through a conductor
What is the unit of measure for electromotive force?
Volt (V)
Most residential wiring is rated at how many volts?
120 V and 240 V
Resistance (R)
The opposition to the flow of electrons through a conductor, similar to friction
What is the unit of measure for resistance?
Ohms (Ω)
When wire is used as a conductor, its resistance is primarily based on what three factors?
Material, diameter, and length
Power (P)
The rate of doing work
What is the unit of measurement for power?
Watts (W) or volt-amperes (VA)
Power determines how fast a certain amount of ____ is consumed by a ____.
Energy; load
Work
How much power is consumed over a period of time
What do joules (J) measure?
Work
