| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.40 |
| Score | 0% | 68% |
| 5.5 A | |
| 5 A | |
| 4.5 A | |
| 7 A |
Ohm's law specifies the relationship between voltage (V), current (I), and resistance (R) in an electrical circuit: V = IR.
Solved for current, I = \( \frac{V}{R} \) = \( \frac{450}{90} \) = 5 A
You would measure the amount of current through a circuit with a(n):
potentiometer |
|
ammeter |
|
voltmeter |
|
battery |
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.
An engineer who wants to document an electric circuit would create which of the following?
a layout |
|
a blueprint |
|
a schematic |
|
a matrix |
A schematic is the proper name for a drawing of an electric or electronic circuit.
From what energy do photovoltaic cells produce electrical energy?
chemical |
|
nuclear |
|
magnetic |
|
sun |
A photovoltaic cell (also known as a solar cell) converts energy from the sun into electrical energy.
The voltage output of a transformer primarily depends on which of the following?
the diameter of the wire in the coils |
|
the number of turns in the wire of the coils |
|
the diameter of the coils |
|
the conductor used for the wire in the coils |
A transformer utilizes an inductor to increase or decrease the voltage in a circuit. AC flowing in a coil wrapped around an iron core magnetizes the core causing it to produce a magnetic field. This magnetic field generates a voltage in a nearby coil of wire and, depending on the number of turns in the wire of the primary (source) and secondary coils and their proximity, voltage is induced in the secondary coil.