Current, potential difference & resistance Flashcards
Name an electrical component that whose resistance decreases when it is moved into brighter light.
Light dependent resistor (LDR)
Name and electrical component whose resistance decreases as its temperature increases.
Thermistor
How does a fuse work
What is current
The rate of flow of charge.
What is voltage?
The energy transferred per unit charge passed
State the equation linking voltage, current and resistance.
V=IR
What is resistance measured in?
Ohms
What is the letter use for Charge.
Q
What is the letter for charge
I
State the equation linking charge current and time.
Q=It
1 mA is…
… a 1000th of one A
What is potential difference?
Energy transferred per coulomb of charge.
What is the unit of charge?
Coulomb.
Recall the equation for energy transfer.
E=Qt or E=IVt as Q=I
