Electricity and Magnetism Formulas Flashcards
1
Q
Charge
A
current × time
2
Q
Resistance
A
voltage(p.d.) ÷ current
3
Q
Voltage
A
current × resistance
4
Q
Input voltage × input current
A
output voltage × output current
5
Q
output voltage ÷ input voltage
A
turns on output coil ÷ turns on input coil
6
Q
Combined resistance(in parallel circuits)
A
resistances multiplied ÷ resistances added
7
Q
Power
A
voltage(p.d.) × current
8
Q
Power loss
A
current² × resistance
9
Q
Energy transformed
A
voltage(p.d.) × current × time taken
OR
power × time taken
10
Q
Electromotive force
A
energy ÷ charge
11
Q
Combined resistance(in series circuits)
A
R₁ + R₂ + R₃…
