Current electricity Flashcards
1
Q
What is electric current?
A
The rate of flow of electric charge
2
Q
What is potential difference?
A
The amount of electrical work done, per unit charge flowing through a component.
3
Q
What is EMF(electromotive force)
A
The amount of electrical work done per unit charge by a power supply, such as a cell in an electrical circuit
4
Q
What is resistance and what is a superconductor?
A
- The opposition of the conductor to the electrical current flowing through it.
- a material whose resistance drops to 0 below a specific temperature
5
Q
what is ohms law
A
a law stating that electric current is proportional to voltage and inversely proportional to resistance
6
Q
What is an ohmic conductor
A
a conductor that obeys Ohms law
7
Q
What is a thermistor?
A
a component whose resistance varies with temperature. Most thermistors are NTC(negative temperature coefficient) which means their resistance decreases as temperature increases.
