| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.59 |
| Score | 0% | 72% |
| 18 A | |
| 6 A | |
| 2 A | |
| 3 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 = \( \frac{V}{R} \) = \( \frac{600}{100} \) = 6 A
From what energy do photovoltaic cells produce electrical energy?
chemical |
|
sun |
|
nuclear |
|
magnetic |
A photovoltaic cell (also known as a solar cell) converts energy from the sun into electrical energy.
This circuit component symbol represents a(n):
inductor |
|
transistor |
|
capacitor |
|
diode |
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.
What is the voltage of most household electrical systems in the United States?
60Hz |
|
220V |
|
110V |
|
60V |
Most households use electricity with a voltage of 110V.
The ohm is a unit of measurement for:
energy |
|
resistance |
|
capacitance |
|
power |
Resistance is opposition to the flow of current and is measured in ohms (Ω). One ohm is defined as the amount of resistance that will allow one ampere of current to flow if one volt of voltage is applied. As resistance increases, current decreases as resistance and current are inversely proportional.