| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.83 |
| Score | 0% | 77% |
You would measure the amount of current through a circuit with a(n):
ammeter |
|
battery |
|
potentiometer |
|
voltmeter |
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.
What type of current flows in only one direction in a circuit?
alternating |
|
parallel |
|
direct |
|
series |
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.
| 600 W | |
| 1191 W | |
| 400 W | |
| 1200 W |
Using a fuse with a current rating higher than that required by a circuit:
is recommended |
|
makes no difference |
|
is required |
|
makes the circuit less safe |
A fuse is a type of low resistance resistor that stops current flow in a circuit in response to a larger than intended electric current flow. Using a fuse with a higher current rating than required by a circuit is less safe as it could potentially allow overcurrent and risk a fire or heat-related equipment damage.
The ohm is a unit of measurement for:
resistance |
|
capacitance |
|
energy |
|
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.