| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.80 |
| Score | 0% | 56% |
Why does current in an electric circuit create heat?
current is naturally hot |
|
voltage 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.
Which of the following is not a common type of battery?
wet cell |
|
dry cell |
|
power-cycle |
|
deep-cycle |
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 direct current (DC) is a battery. The three most common types of batteries are dry cell (used in small devices like TV remotes), wet cell (used for cars), and deep-cycle (storage batteries used primarily for backup and emergency power).
This circuit component symbol represents a(n):
DC source |
|
transformer |
|
transistor |
|
AC source |
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.
The sum of the voltage drops across each resistor in a __________ circuit will equal the total voltage applied to the circuit.
parallel |
|
series |
|
series-parallel |
|
closed |
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.
In an electronic circuit, a thermocouple can be used to:
link the temperature of one component in the circuit to that of another component in the circuit |
|
keep the circuit at a designated safe temperature |
|
increase or decrease the temperature of a component in the circuit |
|
open or close a circuit at a designated temperature |
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.