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41 Cards in this Set
- Front
- Back
For a circuit containing a power supply, current will only flow if the circuit is _____. |
closed |
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To measure the current thru a circuit element, an ammeter must be hooked in _____ with the circuit element. |
series |
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To measure the voltage thru a circuit element, a voltmeter must be hooked in _____ with the circuit element. |
parallel
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The current into a circuit element is _____ the current out of the circuit element. |
equal to
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If one bulb is brighter than an identical bulb, then the current thru the brighter bulb is _____. |
larger
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Increasing the voltage across a bulb causes a ______ current thru the bulb. |
larger
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The sum of the voltage rises and drops around any closed path is _____. |
zero
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The current that enters a node _____ the current that leaves that node. |
equals
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As the total resistance of a circuit increases, the current thru the power supply or battery ______. |
decreases
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When bulbs are added in series to a circuit, the total resistance _____. |
increases
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When bulbs are added in parallel to a circuit, the total resistance _____. |
decreases |
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The _____ thru bulbs in a series are equal. |
current
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The currents thru two circuit elements that are connected in series are _____. Driving this current thru the circuit element with the bigger resistance requires a ____ voltage. |
same, bigger
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The _____ across bulbs in parallel are equal. |
voltage
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The voltages across two circuit elements that are connected on parallel are _____. For the parallel branch with the bigger resistance, this voltage causes a current which is _____. |
equal, smaller
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A battery is a source of constant _____. It is not a source of constant _____. |
voltage, current
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The branches of a parallel network are independent if they are also in parallel with _____. |
the battery/power source |
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Kirchoff's Loop Law |
The sum of the voltage rises and drops around any closed path is zero. |
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Kirchoff's Node Law |
The current that enters a node equals the current that leaves that node. |
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Current (definition) |
The rate of flow of charge thru a cross section of a wire. |
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Current (equation) |
I=dQ/dt |
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Current (SI unit) |
Ampere (A) |
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Electric Potential (equation) |
V=KQ/R |
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Electric Potential (definition) |
The amount of electric potential energy for each coulomb of test charge. |
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Ground |
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A voltmeter measures __________________ across two probes. |
the potential difference |
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Potential Difference (equation) |
ΔV= V(final)-V(initial) or V(+ probe)-V(- probe) |
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Electric Field Lines for Positive Charges |
Perpendicular to equipotential lines, going from large to small electric potentials. |
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Electric Field Lines for Negative Charges |
Perpendicular to equipotential lines, going from small to large electric potentials. |
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Battery |
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Voltmeter |
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Ammeter |
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Current |
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Lightbulb |
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Resistor |
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Open Switch |
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The electric potential of the earth is chosen to be _________. |
zero |
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Potential Energy of 2 Point Charges |
U(Q1+Q2)=KQ1Q2/R |
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Electric Potential Energy |
KQ(source)Q(test)/R |
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Potential Energy (equation) |
U=qV |
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Relationship Between Electric Field and Electric Potential |
The electric field is equal to the negative gradient of the electric potential |