| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.43 |
| Score | 0% | 69% |
Electrical power is measured in:
amperes |
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watts |
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coulombs |
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volts |
Electrical power is measured in watts (W) and is calculated by multiplying the voltage (V) applied to a circuit by the resulting current (I) that flows in the circuit: P = IV. In addition to measuring production capacity, power also measures the rate of energy consumption and many loads are rated for their consumption capacity. For example, a 60W lightbulb utilizes 60W of energy to produce the equivalent of 60W of heat and light energy.
A transistor works by allowing a small amount of current to control general current flow. Where is the small amount of current applied?
emitter |
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collector |
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base |
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input |
The transistor is the foundation of modern electronic devices. It is made entirely from semiconductor material (making it a solid state device) and can serve many different functions in a circuit including acting as a switch, amplifier, or current regulator. A transistor works by allowing a small amount of current applied at the base to control general current flow from collector to emitter through the transistor.
You would measure the amount of current through a circuit with a(n):
voltmeter |
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potentiometer |
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battery |
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ammeter |
Current is the rate of flow of electrons per unit time and is measured in amperes (A). An ammeter is used to measure the electric current in a circuit.
The formula specifying Ohm's law is which of the following?
V = I2R |
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\(V = {R \over I}\) |
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V = IR |
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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.
A diode to an electronic circuit is like a _______________ to a city?
parking lot |
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one-way street |
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highway |
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traffic light |
A diode allows current to pass easily in one direction and blocks current in the other direction.