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30 Cards in this Set
- Front
- Back
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Current |
Flow of charge |
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Charge (Q coulombs ) |
Current x time taken |
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Diode |
Allows current in one direction only |
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Voltmeter |
Always connected in parallel to measure volts |
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Ammeter |
Connected in series to measure current |
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Potential difference = |
Energy transferred / charge Q |
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Resistance (ohms) |
Voltage / current |
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Ohms law |
The current and potential difference across a resistor is directly proportional so long as temperature is constant |
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Current Pd graph for filament lamp |
Back (Definition) |
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Current pd graph for a diode |
Back (Definition) |
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Thermistor |
When the temperature increases the resistance decreases |
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Light dependent resistor |
When the light intensity increases the resistance decreases |
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In a series circuit what happened to the current |
It is the same everywhere through each component |
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What happens to the voltage in a series circuit |
It is split, sum of the pd of cells = sum of all components |
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What happens to the voltage in a series circuit |
It is split, sum of the pd of cells = sum of all components |
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In a series how do you work out the total resistance |
Add up all the resistances of the different components |
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What happens to the current in a parallel circuit |
Sum of the currents through the separate branches |
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What happens to the voltage in a series circuit |
It is split, sum of the pd of cells = sum of all components |
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In a series how do you work out the total resistance |
Add up all the resistances of the different components |
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What happens to the current in a parallel circuit |
Sum of the currents through the separate branches |
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What happens to the voltage in a parallel circuit |
The potential difference across each component is the same |
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Total resistance in a parallel circuit |
1/ R total = 1/ R1 + 1/R2 |
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The more resistors there are in a parallel circuit |
The smaller the total resistance |
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In a series circuit adding more resistors |
Increases the total resistance |
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The total of two/more components in parallel |
Is less than the resistance of the resistor with the least resistance |
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Power = |
Energy transferred / time |
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Power supplied = |
Current x voltage |
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Power to resistor = |
Current squared x resistance |
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Charge flow = |
Current x time |
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Energy transferred = |
Charge flow x potential difference |
