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23 Cards in this Set
- Front
- Back
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Cell |
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Battery |
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Open switch |
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Closed switch |
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Lamp |
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Voltmeter |
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Ammeter |
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Resistor |
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Variable resistor |
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Diode |
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Fuse |
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LED |
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Thermistor |
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LDR |
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Kirchoff's 1st law |
For any point in an electrical circuit, the sum of currents into that point is equal to the sum of the currents out of that point. |
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Symbol for electrical current? |
I |
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Unit of electrical current? |
amps (A) amperes |
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How to measure current? |
Use an ammeter in series. |
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Define current |
Rate of flow of charge. |
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Electrical charge symbol |
Q |
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Electrical charge unit |
coulombs (C) |
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Equation involving current and charge? |
I = Q/t |
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A mobile phone charger draws 500 mA and takes 4 hours to charge a phone. Calculate the charge transferred in that time. |
I = 500 * 10^-3 A t = 4 * 60 * 60 seconds I = Q/t Q = It = 7200 C |
