| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.87 |
| Score | 0% | 57% |
The joule is a unit of measurement for:
resistance |
|
energy |
|
power |
|
capacitance |
The joule is a unit of measurement for energy.
The sum of the voltage drops across each resistor in a __________ circuit will equal the total voltage applied to the circuit.
closed |
|
series |
|
series-parallel |
|
parallel |
A series circuit has only one path for current to flow. In a series circuit, current (I) is the same throughout the circuit and is equal to the total voltage (V) applied to the circuit divided by the total resistance (R) of the loads in the circuit. The sum of the voltage drops across each resistor in the circuit will equal the total voltage applied to the circuit.
Which of the following is not a characteristic of direct current?
used to power your cell phone |
|
electrons flow in only one consistent direction |
|
cannot easily travel distances without power loss |
|
an example power source is a generator |
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 DC is a battery. In contrast to the constant one-way flow of direct current, alternating current changes direction many times each second. Electricity is delivered from power stations to customers as AC because it provides a more efficient way to transport electricity over long distances.
From what energy do photovoltaic cells produce electrical energy?
nuclear |
|
magnetic |
|
chemical |
|
sun |
A photovoltaic cell (also known as a solar cell) converts energy from the sun into electrical energy.
What kind of diode allows current to flow in the opposite direction once a certain voltage threshold is reached?
v-type diode |
|
standard diode |
|
zener diode |
|
light emitting diode |
A diode allows current to pass easily in one direction and blocks current in the other direction. A zener diode is a diode which allows current to flow in one direction as normal and will also allow current flow in the reverse direction when the voltage is above a certain value. This value is called the breakdown voltage.