Electricity Flashcards
(15 cards)
In a parallel circuit, what happens to potential difference when current splits into 2 branches?
Potential difference stays the same
What is ohm’s law?
Current through a component is proportional to the potential difference when temperature is constant
In a parallel circuit, what happens to total resistance?
Total resistance decreases and is less than in any individual component
What is the voltage and frequency of UK mains electricity?
230 V
50 Hz
What colour is a:
-live wire?
-neutral wire?
-earth wire?
Live - brown
Neutral - blue
Earth - green/yellow
What does a step up transformer do?
-how much does (answer) change by?
Increases potential difference
-changes from 25,000 V to 132,000 V
What does a step down transformer do?
Lowers potential difference
What is a benefit of reducing current?
Reduces heat and energy loss
What does the national grid consist of?
Transmission cables and transformers
In a thermistor, when temperature increases, what happens to resistance?
Decreases
In an LDR, as light intensity increases, what happens to resistance?
Decreases
What is a diode?
Only lets current flow in one direction
What is an electrical field?
An area around an electrical charge that may influence other charged particles
What is the function of an earth wire?
Prevents the appliance from becoming live
In a series circuit, what happens to current across components?
Stays the same
