| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.30 |
| Score | 0% | 66% |
This circuit component symbol represents a(n):
transformer |
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DC source |
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AC source |
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capacitor |
Direct current flows in only one direction in a circuit, from the negative terminal of the voltage source to the positive. A common source of direct current (DC) is a battery.
The formula specifying Ohm's law is which of the following?
\(V = {R \over I}\) |
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\(V = {I \over R}\) |
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V = IR |
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V = I2R |
Ohm's law specifies the relationship between voltage (V), current (I), and resistance (R) in an electrical circuit: V = IR.
Why does current in an electric circuit create heat?
the wire in the circuit burns when current passes through |
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voltage is naturally hot |
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heat is created when the current overcomes resistance in the wire |
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current is naturally hot |
Current in an electric circuit creates heat when the current overcomes resistance in the wire.
A capacitor to an electronic circuit is like a _______________ to a house?
safe |
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driveway |
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gate |
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storage shed |
Capacitors store electricity and are used in circuits as temporary batteries. Capacitors are charged by DC current (AC current passes through a capacitor) and that stored charge can later be dissipated into the circuit as needed. Capacitors are often used to maintain power within a system when it is disconnected from its primary power source or to smooth out or filter voltage within a circuit.
Which of the following is a characteristic of batteries connected in parallel?
total current equals the sum of the individual battery currents |
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the positive terminal of one battery is connected to the negative terminal of the next |
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one connection is made between each adjacent battery |
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total current equals the average of the individual battery currents |
You can multiply the voltage or the current supplied by individual batteries by connecting them together either in series or in parallel. The characteristics of batteries connected in parallel are that total voltage equals the average of the individual battery voltages, total current equals the sum of the individual battery currents, the positive terminal of one battery is connected to the positive terminal of the next, the negative terminal of one battery is connected to the negative terminal of the next, and two connections are made between each adjacent battery.