ELECTRICITY SCIENCE 8 REVIEW

1. 1. Which refers to an electric charge?

• A. It is the study of charges at rest.

• B. It makes the protons negatively charged.

• C. It consists of positive and negative charges.

• D. It is composed of equal and unequal charges.

2. 2. What is the difference between static and current electricity?

• A. Static electricity has alternating current (AC) while current electricity

  has direct current (DC).

• B. Static electricity charges are at rest and they are accumulating on the

  surface of the insulator while in current electricity the electrons are moving inside the conductor.

• C. Static electricity is a phenomenon from the flow of electrons along a

  conductor while current electricity is caused by building up of electrical

  charges on the surface of objects.

• D. Static electricity has charges that flow from an area of high voltage to

  an area of low voltage while in current electricity the charges flow

  from an area of low voltage to an area of high voltage.

3. When a person combs her hair, static electricity is sometimes generated by what process?

• A. Induction between comb and hair.

• B. Deduction between comb and hair.

• C. Friction between comb and hair transfers electrons.

• D. Contact between the comb and hair results in charge.

4. 4. How is electric current related to electric charge?

• A. An electric current is the flow of electric charge.

• B. The electrical current is measured by the electric charges.

• C. There is no relationship existing between current and charge.

• D. The higher the electric current, the slower the electric charges.

5. 5. Which is NOT a requirement to produce an electric current?

• A. A voltage source

• B. An insulator like rubber

• C. A source of energy that moves charges

• D. An electric field moving through a conductor

5. 6. Which refers to the amount of charge flowing through a cross-sectional

   area of a wire per unit of time?

• A. Current

• B. Power

• C. Resistance

• D. Voltage

7. 7. Which of the following is correctly matched?

• A. Power – Joules

• B. Current – Volts

• C. Voltage - Ampere

• D. Resistance - Ohms

8. 8. Which of the following law explains that current is equal to voltage divided by the resistance?

• A. Law of Inertia

• B. Law of Gravity

• C. Gas Laws

• D. Ohm’s Law

9.  What equation would you use to solve for voltage?

• A. V=I/R

• B. V=PR

• C. V=IR

• D. V= R/I

10. 10. If the current in an electrical circuit is constant, what will happen to the

    voltage if the resistance is increased?

• A. The voltage will decrease

• B. The voltage will increase

• C. The voltage will stay the same

• D. The voltage is cancelled