Resistance: Calculations in Electric Circuits 2

Question	Answer
Current in a series circuit	Current is the same at every point along the wire
Current in a parallel circuit	Different-sized currents can flow through parallel parts of a circuit
Voltage in circuits	The potential difference of the full circuit equals the sum of all the potential differences in the circuit
Current in circuits	The sum of the currents entering a point in a circuit equals the sum of the currents leaving it
Formula for resistors in series	R = R₁ + R₂
Formula for resistors in parallel	1/R = 1/R₁ + 1/R₂
Derivation of formula for resistors in series	V = V₁ + V₂ --> IR = IR₁ + IR₂ (Since V = IR) --> R = R₁ + R₂ (by dividing by I)
Derivation of formula for resistors in parallel	I = I₁ + I₂ --> V/R = V/R₁ + V/R₂ (since I = V/R) --> 1/R = 1/R₁ + 1/R₂ (by dividing by V)

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