# Equations sheet

```π
π
π
10−6
10−9
10−12
Name
Current
Total charge
Negative terminal
πΌ
Δπ
Positive terminal
Resistance
Ohm's Law
πΌ=
Δπ
Δπ‘
π΄=
Δπ = πΌΔπ‘
π₯ππππ‘
π
π
Rate at which energy is transferred from
the battery to the moving charges
Power delivered by a source of emf
Rate at which energy is transferred from
the current to the resistor
Kirchhoffs loop
law
Series Resistors
Parallel Resistors
Series Capacitors
πΆππ’π
π =0; π =0
π₯π = ππ₯ππππ‘
The potential difference of (over) a battery
= the potential difference of (over) a battery with
no current
π₯ππππ‘ slightly &lt; π when with a current
π=π
πΏ
π΄
πΌ = Δπ π
ππππ‘ = ΔπΔπ‘ = ΔπΔπ‘ π
ππππ = πΌ π
ππ = ΔπΔπ‘ = ΔπΔπ‘ Δππ = πΌ Δππ
ππ = ππππ‘
Kirchhoff's junction law
πΆππ’π
π ππ
π = π₯ππππ‘ ; π = ππ₯ππππ‘
Energy gained
Electromotive force
SI Unit
Symbol
ππ = πΌ Δππ = πΌ 2 π =
οΏ½ πΌππ = οΏ½ πΌππ’π‘
πβπ
π=
(Δππ )2
π
Δπππππ = οΏ½ Δππ = 0
π
Δππππ‘ = π &gt; 0 ; Δππ = −πΌπ &lt; 0
πππ = π1 + π2 + β―
−1
1
1
πππ = οΏ½ +
+ β―οΏ½
π1 π2
πΆππ
−1
1
1
= οΏ½ + + β―οΏ½
πΆ1 πΆ2
1
π½
π
```