| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.18 |
| Score | 0% | 64% |
Why does current in an electric circuit create heat?
voltage is naturally hot |
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the wire in the circuit burns when current passes through |
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current is naturally hot |
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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.
In an electronic circuit, a thermocouple can be used to:
open or close a circuit at a designated temperature |
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increase or decrease the temperature of a component in the circuit |
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keep the circuit at a designated safe temperature |
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link the temperature of one component in the circuit to that of another component in the circuit |
A thermocouple is a temperature sensor that consists of two wires made from different conductors. The junction of these two wires produces a voltage based on the temperature difference between them and can be used like a switch to open or close the circuit at a designated temperature.
Which of the following is the same for each branch of a parallel circuit?
current |
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resistance |
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voltage |
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power |
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.
This circuit component symbol represents a(n):
transformer |
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inductor |
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potentiometer |
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fuse |
Resistors are used to limit voltage and/or current in a circuit and can have a fixed or variable resistance. Variable resistors (often called potentiometers or rheostats) are used when dynamic control over the voltage/current in a circuit is needed, for example, in a light dimmer or volume control.
| 1800 W | |
| 1620 W | |
| 600 W | |
| 1801.5 W |