| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.24 |
| Score | 0% | 65% |
Which of the following can conduct electricity under some conditions but not others?
conductor |
|
resistor |
|
semiconductor |
|
insulator |
Semiconductors have valence shells that are exacly half full and can conduct electricity under some conditions but not others. This property makes them useful for the control of electrical current.
A diode to an electronic circuit is like a _______________ to a city?
one-way street |
|
highway |
|
parking lot |
|
traffic light |
A diode allows current to pass easily in one direction and blocks current in the other direction.
Which of the following is a characteristic of batteries connected in parallel?
one connection is made between each adjacent battery |
|
total current equals the sum of the individual battery currents |
|
the positive terminal of one battery is connected to the negative terminal of the next |
|
total current equals the average of the individual battery currents |
You can multiply the voltage or the current supplied by individual batteries by connecting them together either in series or in parallel. The characteristics of batteries connected in parallel are that total voltage equals the average of the individual battery voltages, total current equals the sum of the individual battery currents, the positive terminal of one battery is connected to the positive terminal of the next, the negative terminal of one battery is connected to the negative terminal of the next, and two connections are made between each adjacent battery.
You would measure the amount of resistance at a certain point in a circuit with a(n):
ammeter |
|
potentiometer |
|
ohmmeter |
|
voltmeter |
Resistance is opposition to the flow of current and is measured in ohms (Ω). An ohmmeter is used to measure the amount of resistance at a certain point in a circuit.
In an electronic circuit, a thermocouple can be used to:
open or close a circuit at a designated temperature |
|
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 |
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.