3: Equations Flashcards
1
Q
EMF equations (3)
A
Ɛ = V + v
Ɛ = I(R+r)
V=Ɛ - Ir
Ɛ = EMF (V) V = Terminal p.d (V) v = lost volts (V) I = current (A) R = Load Resistance r = Internal resistance
2
Q
EMF in series
A
Ɛₜₒₜₐₗ = Ɛ₁ + Ɛ₂ + Ɛ₃ + …
3
Q
EMF in parallel
A
Ɛₜₒₜₐₗ = Ɛ₁ = Ɛ₂ = Ɛ₃ = …
4
Q
Total current entering a junction =
A
Total current leaving it
5
Q
Total EMF around a series circuit =
A
The sum of the pd.s across each component
6
Q
Which R is which in the equation:
Vₒᵤₜ = Vᵢₙ * R₂ / (R₁+R₂)
A
R₂ is the resistor you are measuring p.d (have the voltmeter) across
