| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.55 |
| Score | 0% | 71% |
You would measure the amount of resistance at a certain point in a circuit with a(n):
ammeter |
|
voltmeter |
|
ohmmeter |
|
potentiometer |
Resistance is opposition to the flow of current and is measured in ohms (Ω). An ohmmeter is used to measure the amount of resistance at a certain point in a circuit.
You would measure the amount of current through a circuit with a(n):
potentiometer |
|
battery |
|
voltmeter |
|
ammeter |
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.
Which of the following will help to prevent a short circuit?
transistor |
|
fuse |
|
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.
A diode to an electronic circuit is like a _______________ to a city?
traffic light |
|
parking lot |
|
highway |
|
one-way street |
A diode allows current to pass easily in one direction and blocks current in the other direction.
A capacitor to an electronic circuit is like a _______________ to a house?
safe |
|
driveway |
|
storage shed |
|
gate |
Capacitors store electricity and are used in circuits as temporary batteries. Capacitors are charged by DC current (AC current passes through a capacitor) and that stored charge can later be dissipated into the circuit as needed. Capacitors are often used to maintain power within a system when it is disconnected from its primary power source or to smooth out or filter voltage within a circuit.