Electricity and Magnetism

Atoms are made up of:

I. Protons

II. Neutrons

III. Electrons

• I & III

• II & III

• I & II

• All of the above

A positive and negative charge will always _____.

• attract

• remain neutral

• repel

• orbit

Which of the following materials are good example of electrical insulators?

I. Metals

II. Wood

III. Plastic

• I & II

• I & III

• II & III

• All of the above

What is the voltage if a resistance of 2 Ω produces a current of 60 amperes?

• 1200 V

• 12 V

• 30 V

• 120 V

What is the voltage if a resistance of 5 Ω produces a current of 25 amperes?

• 5 V

• 125 V

• 250 V

• 50 V

Which of the following circuit symbols represents a battery?

• 
• 
• 
• 

Electricity can produce magnetism.

• True

• False

The more coils around an electromagnet, the weaker it is.

• True

• False