| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.57 |
| Score | 0% | 71% |
| 35 Ω | |
| 77 Ω | |
| 23 Ω | |
| 70 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 = \( \frac{V}{I} \) = \( \frac{420}{6} \) = 70 Ω
Which of the following converts electrical energy into another form of energy in an electrical circuit?
DC source |
|
wiring |
|
load |
|
AC source |
A load is a source of resistance that converts electrical energy into another form of energy. The components of a microwave, for example, are loads that work together to convert household electricity into radation that can be used to quickly cook food.
An amplifier is most similar in function to which of the following:
step-down transformer |
|
transistor |
|
step-up transformer |
|
capacitor |
An amplifier is a device that takes a small input signal and creates a larger output signal. This makes it most similar to a step-up transformer which takes a smaller input voltage and creates a larger output voltage.
Which of the following will help to prevent a short circuit?
fuse |
|
transistor |
|
diode |
|
resistor |
Fuses are thin wires that melt when the current in a circuit exceeds a preset amount. They help prevent short circuits from damaging circuit components when an unusually large current is applied to the circuit, either through component failure or spikes in applied voltage.
The formula specifying Ohm's law is which of the following?
\(V = {I \over R}\) |
|
V = I2R |
|
V = IR |
|
\(V = {R \over I}\) |
Ohm's law specifies the relationship between voltage (V), current (I), and resistance (R) in an electrical circuit: V = IR.