| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.47 |
| Score | 0% | 69% |
| 48 V | |
| 20 V | |
| 40 V | |
| 36 V |
Ohm's law specifies the relationship between voltage (V), current (I), and resistance (R) in an electrical circuit: V = IR.
V = \( I \times R \) = \( 0.5 \times 80 \) = 40 V
Which of the following allows DC to pass easily but resists the flow of AC?
semiconductor |
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inductor |
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transformer |
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capacitor |
An inductor is coiled wire that stores electric energy in the form of magnetic energy and resists changes in the electric current flowing through it. If current is increasing, the inductor produces a voltage that slows the increase and, if current is decreasing, the magnetic energy in the coil opposes the decrease to keep the current flowing longer. In contrast to capacitors, inductors allow DC to pass easily but resist the flow of AC.
The formula specifying Ohm's law is which of the following?
V = IR |
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\(V = {R \over I}\) |
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V = I2R |
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\(V = {I \over R}\) |
Ohm's law specifies the relationship between voltage (V), current (I), and resistance (R) in an electrical circuit: V = IR.
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.
You would measure the amount of resistance at a certain point in a circuit with a(n):
potentiometer |
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voltmeter |
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ohmmeter |
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ammeter |
Resistance is opposition to the flow of current and is measured in ohms (Ω). An ohmmeter is used to measure the amount of resistance at a certain point in a circuit.