| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.47 |
| Score | 0% | 69% |
Direct current flows from the __________ terminal of the voltage source to the __________ terminal.
positive, negative |
|
negative, positive |
|
positive, positive |
|
negative, negative |
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.
Why is an insulator a poor conductor of electricity?
an insulator has many free electrons |
|
an insulator is made of organic material |
|
an insulator is made of inorganic material |
|
an insulator has few free electrons |
Insulators have valence shells that are more than half full of electrons and, as such, are tightly bound to the nucleus and difficult to move from one atom to another.
The rate of flow of electrons per unit time is which of the following?
resistance |
|
conductance |
|
voltage |
|
current |
Current is the rate of flow of electrons per unit time and is measured in amperes (A). A coulomb (C) is the quantity of electricity conveyed in one second by a current of one ampere.
Current is the rate of flow of electrons per unit time and is measured in:
volts |
|
ohms |
|
amperes |
|
coulombs |
Current is the rate of flow of electrons per unit time and is measured in amperes (A). A coulomb (C) is the quantity of electricity conveyed in one second by a current of one ampere.
Longer the electrical wires mean _______________ voltage drop.
complete |
|
diminishing |
|
lesser |
|
greater |
Electrical wires have a certain amount of resistance per foot. A longer wire means more resistance and a greater voltage drop.