Electronics Information Practice Question Answers

1. Choice "d" is the correct choice. Ohm's law is shown in mathematical form in choice "a." Choice "c" says the same thing but expresses it differently. Choice "b" is incorrect.

2. The correct answer is "c." The outer shell gives a substance its electrical properties. The outer shell is called the "valence shell."

3. The correct answer is "c." It is the valence shell that determines a substance's electric properties. Depending on the total number of electrons, the first and second shells are filled first. If a metal or other substance has sufficient electrons to populate the third or valence shell, the resulting configuration will determine whether the element is a conductor, a semi-conductor, or an insulator.

4. The correct answer is "b." Some materials conduct electrical current very easily. Sometimes this is desirable and sometimes it is not. A semi-conductor will allow electrical current to pass through it but will also subject it to some resistance. This restricted flow capacity of the semi-conductor is beneficial when put to appropriate technological uses.

5. The correct answer is "d." Household current is alternating current and flows in two directions at 60 hertz. Each time the current cycles, it goes from zero to 60 hertz in both directions. Within the space of one second, the cycle of current occurs 60 times in household alternating current.

6. The components of a basic circuit are a source of the voltage, the electrical load, a conductor (such as copper wire), and a completed circuit. A switch is unnecessary to current flow, though it certainly helps to be able to open and close the circuit. Current will pass through air but it usually prefers more stable circuitry such as a copper wire; it does not, however, flow upon radio waves. Choice "a" is the correct answer here.

7. The correct answer is "a." Pure silicon is a very stable substance with no free electrons that would allow current flow. "Doping" the silicon by adding impurities like phosphorous, arsenic, or antimony to it causes a free electron to move throughout the crystal. This allows for conductivity.

8. Voltage, in choice "d," is the correct answer. A force is always needed to make electric current flow through a circuit. The force that drives the current through a wire or other material is called voltage. Choice "b" is wrong because amperage is a measure of the electricity flow rate. Just as the name implies, "Resistance" is the process of impeding electrical flow, so option "c" is also wrong. Choice "d" is the correct answer.