| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.33 |
| Score | 0% | 67% |
You would measure the amount of resistance at a certain point in a circuit with a(n):
ammeter |
|
voltmeter |
|
potentiometer |
|
ohmmeter |
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.
Which of the following will increase the magnetic field produced by the electric current in a wire?
construct the wire from conductive material |
|
wrap the wire around a ceramic core |
|
construct the wire from insulative material |
|
wind the wire into a coil |
A moving electric current produces a magnetic field proportional to the amount of current flow. This magnetic field can be made stronger by winding the wire into a coil and further enhanced if done around an iron containing (ferrous) core.
A __________ electric current produces a magnetic field proportional to the amount of current flow.
moving |
|
stationary |
|
high voltage |
|
low voltage |
A moving electric current produces a magnetic field proportional to the amount of current flow. This magnetic field can be made stronger by winding the wire into a coil and further enhanced if done around an iron containing (ferrous) core.
Resistance is opposition to which of the following?
voltage |
|
conductance |
|
current |
|
impedance |
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.
Which of the following is the same for each branch of a parallel circuit?
current |
|
power |
|
voltage |
|
resistance |
In a parallel circuit, each load occupies a separate parallel path in the circuit and the input voltage is fully applied to each path. Unlike a series circuit where current (I) is the same at all points in the circuit, in a parallel circuit, voltage (V) is the same across each parallel branch of the circuit but current differs in each branch depending on the load (resistance) present.