Ch 27 Direct Current Circuits
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19 Terms
1
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The terminal voltage of a battery equals the _______ if the internal resistance is zero.
emf
2
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What is the formula for the total power output of a battery?
P = I ΔV = I ε
3
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What is the formula of power in relation to internal and external resistors
P = I^2(R+r)
4
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How can the percentage of power delivered to a device be maximized?
By keeping the internal resistance of the battery as low as possible.
5
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In resistors connected in series, the currents are _______.
the same
6
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What is the same and what is different for resistors connected in series
Currents are the same, potentials add
7
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What is the same and what is different for resistors connected in parallel
Potentials are the same, currents add
8
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For resistors in parallel, what is the relationship between resistance and current
The lower resistance will have higher currents
9
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What are the two main Kirchhoff rules
Junction rule: at any junction the sum of the currents must equal zero
Loop rule: The sum of potential differences across all elements around any circuits loop must be zero
Loop rule: The sum of potential differences across all elements around any circuits loop must be zero
10
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When a resistor is traversed in the direction of the current, the potential difference across the resistor is _______.
V = -IR
11
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When a resistor is traversed in the direction opposite the current, the potential difference across the resistor is _______.
V = +IR
12
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When a source of emf is traversed opposite the emf (positive to negative), the potential difference is _______.
\-emf
13
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When a source of emf is traversed in the direction of the emf (negative to positive), the potential difference is _______.
\+emf
14
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When does a capacitor stop charging
When it reaches its maximum charge (Q = Cε)
15
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What is the current when the capacitor is fully charged
Zero
16
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What happens to the potential difference across the capacitor as the plates are being charged
It increases
17
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When is the charge of the capacitor zero
When the switch closes
18
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What happens when the maximum charge is reached
The current in the circuit is zero
19
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Consider an RC circuit and assume that the battery has no internal resistance. Just after the switch is closed, the current in the battery is
Just after the switch is closed, there is no charge on the capacitor.
Note 
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