Current only flows one way. Very high resistance in other direction.
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Resistor
Resistance stays constant. Current proportional to pd.
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Variable resistor
Resistance can be set by a human. Used in dimmer switches.
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LED
A diode that gives off light.
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Lamp
Resistance increases as the temperature increases.
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Thermistor
Resistance decreases as the temperature increases.
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LDR
Resistance decreases as the light intensity increases (gets brighter). Used in automatic lights.
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Cell and battery
Provides the potential difference (pd) and energy for a circuit.
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Current (I)
Rate of flow of electrical charge. Measured in Amps (A).
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Charge (Q)
Measured in coulombs (C)
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Potential difference (V)
pd. Energy transferred per unit charge. Measured in volts (V).
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Resistance (R)
Ability to slow current. Measured in Ohms.
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Series Circuit
Current only has one route. Current is the same all they way around. Potential difference is shared across components.
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Parallel Circuit
Current has different paths it could take. Current is shared through each branch. Potential difference is the same across each branch. Total resistance is lower than the smallest signle resistor.
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Voltmeter
Measured pd across a component.
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Ammeter
Measures current through a component.
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Fuse
Resistor that melts if current is too high.
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Q=IxT
charge(C)=Current(A)xTime(s)
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V=IxR
Potential difference(V)=Current(A)xResistance
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Other cards in this set
Card 2
Front
Resistance stays constant. Current proportional to pd.
Back
Resistor
Card 3
Front
Resistance can be set by a human. Used in dimmer switches.
Back
Card 4
Front
A diode that gives off light.
Back
Card 5
Front
Resistance increases as the temperature increases.
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