| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.49 |
| Score | 0% | 70% |
Electrical power is measured in:
coulombs |
|
amperes |
|
watts |
|
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.
| 3.5 A | |
| 5 A | |
| 1.75 A | |
| 7 A |
Ohm's law specifies the relationship between voltage (V), current (I), and resistance (R) in an electrical circuit: V = IR.
Solved for current, I = \( \frac{V}{R} \) = \( \frac{70}{20} \) = 3.5 A
If an electrical circuit is interrupted, which of the following will result?
parallel circuit |
|
closed circuit |
|
open circuit |
|
short circuit |
A closed circuit is a complete loop or path that electricity follows. It consists of a source of voltage, a load, and connective conductors. If the circuit is interrupted, if a wire is disconnected or cut for example, it becomes an open circuit and no electricity will flow.
This circuit component symbol represents a(n):
transformer |
|
capacitor |
|
DC source |
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AC source |
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 = I2R |
|
V = IR |
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\(V = {I \over R}\) |
|
\(V = {R \over I}\) |
Ohm's law specifies the relationship between voltage (V), current (I), and resistance (R) in an electrical circuit: V = IR.