1
Q
current (A)
A
charge (C) / time (s)
2
Q
voltage (V)
A
current (A) x resistance (Ω)
3
Q
power (W)
A
current (A) x voltage (V)
4
Q
energy transferred (J)
A
current (A) x voltage (V) x time (s)
5
Q
resistors in a series circuit
A
total resistance (Ω) = resistance₁ + resistance₂ … + resistance n
6
Q
resistors in a parallel circuit
A
1 / total resistance (Ω) = 1/ resistance₁ + 1 / resistance₂ … + 1/ resistance n
7
Q
transformers I
A
voltage in secondary coil / voltage in primary coil = turns on secondary coil / turns on primary coil
8
Q
transformers II
A
current in primary coil / current in secondary coil = turns on secondary coil / turns on primary coil
9
Q
transformers III
A
power in primary coil = power in secondary coil
IGCSE Physics Formulae
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