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10 Cards in this Set
- Front
- Back
emf
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the work done per unit charge
SI unit: Volt or J/C m2 · kg · s-3 · A-1 |
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E is equal to the ______ _______ when the current is zero
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terminal voltage
AKA open-circuit voltage |
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load resistance
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Terminal voltage must also equal the potential difference across the external resistance.
E = IR + Ir |
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I = E/R+r
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shows that the current depends on:
-External resistance -Internal resistance |
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If R is much greater than r
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We can neglect r in our analysis
Assume that r is negligible |
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IE = I^2R + I^2r
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Tells us that the total power output IE is converted to the rate I^2 at which energy is delivered to the load resistance plus the rate I^2r at which energy is delivered to the internal resistance.
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emf
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the source that maintains the current in a closed circuit.
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steady state
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assumed that most currents are constant in magnitude and direction.
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Any device that increase the ____ ______ of charges circulating in circuits are sources of emf
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potential energy.
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Think of a source as a ____ ____.
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Charge pump.
Forces electrons to move in opposite direction of electrostatic field inside the source. |