| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.45 |
| Score | 0% | 69% |
Why does current in an electric circuit create heat?
voltage is naturally hot |
|
current is naturally hot |
|
the wire in the circuit burns when current passes through |
|
heat is created when the current overcomes resistance in the wire |
Current in an electric circuit creates heat when the current overcomes resistance in the wire.
From what energy do photovoltaic cells produce electrical energy?
chemical |
|
nuclear |
|
sun |
|
magnetic |
A photovoltaic cell (also known as a solar cell) converts energy from the sun into electrical energy.
Which of the following statements about electrical resistance is true?
the less resistive the conductor is the slower electron flow will be |
|
the more resistive the conductor is the slower electron flow will be |
|
the more resistive the conductor is the faster electron flow will be |
|
electrically conductive materials have no resistive properties |
Resistance is opposition to the flow of current. As resistance increases, current decreases as resistance and current are inversely proportional.
| 96V 160A | |
| 48V 20A | |
| 24V 40A | |
| 12V 80A |
Connecting the 4 batteries in series multiplies their voltage while keeping their current the same yielding a 48V 20A configuration. Connecting the 4 batteries in parallel multiplies their current while keeping their voltage the same yielding a 12V 80A configuration. Using a series-parallel connection, 2 batteries can be connected in series and 2 can be connected in parallel resulting in a 24V 40A configuration.
The watt is a unit of measurement for:
power |
|
frequency |
|
resistance |
|
energy |
Electrical power is measured in watts (W) and is calculated by multiplying the voltage (V) applied to a circuit by the resulting current (I) that flows in the circuit: P = IV. In addition to measuring production capacity, power also measures the rate of energy consumption and many loads are rated for their consumption capacity. For example, a 60W lightbulb utilizes 60W of energy to produce the equivalent of 60W of heat and light energy.