Circuit Formulae/Derivations Flashcards Preview

Physics(Irish Leaving Cert) > Circuit Formulae/Derivations > Flashcards

Flashcards in Circuit Formulae/Derivations Deck (6)
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1
Q

What is the formula for current in a series circuit?

A

I’ = I’’ = I’’’ = It

i.e. Current is the same at any point in a series circuit

2
Q

What is the formula for total resistance in a series circuit?

A

R1 + R2 + R3 = Rt

i.e. sum of individual resistors = total resistance of circuit

3
Q

What is the formula for the total voltage of a parallel circuit (or branch)?

A

V1 = V2 = V3 = Vt

Voltage is the same across all paths, but uses more energy when supplying more paths

4
Q

What is the formula for current in a parallel circuit (or branch)?

A

Current going into junction = Current going out of junction

5
Q

What is the formula for total voltage (emf) in a circuit?

A

V1 + V2 + V3 = Vt

i.e. the sum of the voltage drops across a series circuit = the total voltage

6
Q

What is the formula for total resistance of a parallel branch?

A

1/R1 + 1/R2 + 1/R3 = 1/Rt

Remember to invert answer to find total resistance