| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.37 |
| Score | 0% | 67% |
A transistor works by allowing a small amount of current to control general current flow. Where is the small amount of current applied?
input |
|
collector |
|
base |
|
emitter |
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.
Direct current flows from the __________ terminal of the voltage source to the __________ terminal.
positive, positive |
|
positive, negative |
|
negative, positive |
|
negative, negative |
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.
An amplifier is most similar in function to which of the following:
capacitor |
|
step-up transformer |
|
step-down transformer |
|
transistor |
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.
| 9 Ω | |
| 10 Ω | |
| 30 Ω | |
| 5 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 = \( \frac{V}{I} \) = \( \frac{20}{2} \) = 10 Ω
Longer the electrical wires mean _______________ voltage drop.
diminishing |
|
lesser |
|
complete |
|
greater |
Electrical wires have a certain amount of resistance per foot. A longer wire means more resistance and a greater voltage drop.