Electricity and circuits Flashcards
1
Q
define current electricity
A
the controlled flow of electrons through a conductor
2
Q
define electric current
A
the energy carried by moving electrons
3
Q
what unit do you use to measure electric current?
A
A
Amperes
Amps
4
Q
what device do you use to measure current
A
ammeter
5
Q
define voltage
A
the measure of the difference in energy between two points in the circuit
6
Q
how and what unit do you measure voltage
A
voltmeter
volts
7
Q
define resistance
A
how much something restricts the flow of electrons
8
Q
how and what do you use to measure resistance
A
ohms
(horseshoe)
ohmeter
9
Q
what does the resistance of a substance depend on?
A
- type of material
- temperature
- length of wire
- thickness of wire
10
Q
what are the four parts of a circuit?
A
- the source (battery, generator)
- the load (light bulb, stove)
- the switch
- the conducting wire
