| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.55 |
| Score | 0% | 71% |
| 6.75 A | |
| 2.25 A | |
| 1.5 A | |
| 4.5 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 = \( \frac{V}{R} \) = \( \frac{360}{80} \) = 4.5 A
This circuit diagram represents a(n):
series-parallel circuit |
|
parallel circuit |
|
series circuit |
|
rectifier |
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.
The joule is a unit of measurement for:
power |
|
capacitance |
|
energy |
|
resistance |
The joule is a unit of measurement for energy.
A capacitor is often used for which of the following purposes?
as a primary power source |
|
to maintain power in a circuit when the primary power source is disconnected |
|
to convert alternating current into direct current |
|
to allow a small amount of current to control a large amount of current |
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.
The rate of flow of electrons per unit time is which of the following?
conductance |
|
current |
|
resistance |
|
voltage |
Current is the rate of flow of electrons per unit time and is measured in amperes (A). A coulomb (C) is the quantity of electricity conveyed in one second by a current of one ampere.