| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.61 |
| Score | 0% | 72% |
| 120 Ω | |
| 42 Ω | |
| 43 Ω | |
| 40 Ω |
Ohm's law specifies the relationship between voltage (V), current (I), and resistance (R) in an electrical circuit: V = IR.
Solved for resistance, R = \( \frac{V}{I} \) = \( \frac{180}{4.5} \) = 40 Ω
You would measure the amount of voltage between two points in a circuit with a(n):
voltmeter |
|
reostat |
|
ammeter |
|
battery |
Voltage (V) is the electrical potential difference between two points. A voltmeter is used to measure the voltage between two points in a circuit.
The conversion of alternating current (AC) into direct current (DC) is called:
capacitance |
|
reactance |
|
rectification |
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inductance |
A diode allows current to pass easily in one direction and blocks current in the other direction. Diodes are commonly used for rectification which is the conversion of alternating current (AC) into direct current (DC). Because a diode only allows current flow in one direction, it will pass either the upper or lower half of AC waves (half-wave rectification) creating pulsating DC. Multiple diodes can be connected together to utilize both halves of the AC signal in full-wave rectification.
If an electrical circuit is interrupted, which of the following will result?
short circuit |
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open circuit |
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parallel circuit |
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closed 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.
You would measure the amount of current through a circuit with a(n):
voltmeter |
|
battery |
|
ammeter |
|
potentiometer |
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.