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Resistance

Physics

QuestionAnswer
What happens when you make adjustments to electrical appliances? e.g.turning up the volume on a Tv Resistance is altered
When you do this, your adjustments are also altering the what? Voltage/current in the circuit
All components in a circuit offer what? Some resistance
Connecting wires have how much resistance? Very low, so they let charges pass through very easily
Why might it be harder for current to flow through some other components? If they have higher resistance
when current flows, some energy is used to... move the charges through them and is converted to heat
What is the resistance, voltage, current equation? Voltage = current x resistance
In a thermistor, if the room is cold, will the resistance be higher or lower? Higher, more free electrons to prevent current from flowing
If it's hot, will the resistance be higher or lower? Lower, less free electrons to prevent current from flowing
If an LDR (light dependent resistor) is placed in a dark room, will the resistance increase or decrease? Increase
If an LDR is placed in a light room, will the resistance increase or decrease? Decrease
Explain how a thermistor could be used in a fire alarm When the temperature rises, the resistance will decrease so current can flow through the circuit and set off the alarm.
Explain how an LDR could be used in a light sensitive circuit When the light is shone onto it, the resistance will decrease so more current can flow through the circuit.
Created by: eloiseis