Potential difference & resistance (Edexcel GCSE Physics Combined Science): Flashcards
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What is potential difference?
What is potential difference?
Driving force that causes electric charges to flow
Unit for potential difference
Unit for potential difference
Volts (V)
Instrument to measure potential difference
Instrument to measure potential difference
Voltmeter
How to connect a voltmeter in a circuit
How to connect a voltmeter in a circuit
In parallel with the component
What does resistance do to electrical charges?
What does resistance do to electrical charges?
Slows down the flow of electrical charges
Unit for resistance
Unit for resistance
Ohms (Ω)
Equation relating V, I, and R
Equation relating V, I, and R
What does V represent in ?
What does V represent in ?
Potential difference in volts (V)
What does I represent in ?
What does I represent in ?
Current in amps (A)
What does R represent in ?
What does R represent in ?
Resistance in ohms (Ω)
Formula for energy transferred in a circuit
Formula for energy transferred in a circuit
Charge moved × potential difference
Effect when electrons collide with ions in a resistor
Effect when electrons collide with ions in a resistor
Ions vibrate and heat up
Effect of heating on a resistor
Effect of heating on a resistor
Harder for electrons to pass through
What happens if a resistor gets too hot?
What happens if a resistor gets too hot?
Current stops
How do thermistors behave as they warm up?
How do thermistors behave as they warm up?
Resistance decreases