Electricity Flashcards
What is the equation for electric current in a circuit?
Charge flow / time taken
What is the equation for charge flow?
Current x Time taken
What is the equation for potential difference across a component?
Energy transferred / Charge
What is the equation for resistance?
Potential difference, V (volts) / current, I (Amperes)
What does ohms law state?
The current through a resistor is directly proportional to the potential difference.
What is the equation for resistance?
Potential difference / Current
How do you measure total resistance in a series circuit?
The sum of all the individual resistances.
What happens when you add more resistors in a SERIES circuit?
The resistance increases
What happens to the current and potential difference in a series circuit?
Current stays the same, potential difference splits
How do you find the total potential difference in a PARALLEL circuit?
Add all the resistances under 1 (1/R + 1/R2 etc)
What happens when you add more resistors to a PARALLEL circuit?
Decreases total resistance
What happens to the current and potential difference in a PARALLEL circuit?
The potential difference is the same, the current splits
