Chapter 20 Review

A 1.5 m wire carries a 5.0 A current when a potential difference of 3.7 V is applied.  What is the resistance of the wire?

• 0.74 ohms
• 7.5 ohms
• 1.4 ohms
• 19 ohms

What is the current in a circuit that is attached to a 12 volt battery and has a resistance of 6.0 ohms?

• 0.5 A
• 72 A
• 2 A
• 5 A

A 1700 W machine operates at 120 V.  What is the resistance in the machine?

• 14.2 ohms
• 8.5 ohms
• 0.12 ohms
• 0.071 ohms

What is the voltage of a battery that has a current of 4.0 A and a resistance of 3.0 ohms?

• 1.25 V
• 12 V
• 0.75 V
• 120 V

Tags

NGSS.HS-PS3-5

When you rub a rod with fur, you are charging the rob by

• contact
• induction
• friction
• radiation

If an atom gains electrons, it becomes a

• positively charged ion
• negatively charged ion
• neutral atom
• neutral ion

Which of the following would reduce the resistance of a metal wire?

• increasing its thickness
• increasing its temperature
• increasing its length
• all of the above

What is the unit for electrical resistance?

• ampere
• volt
• watt
• ohm

What is the unit for electric current?

• ampere
• volt
• watt
• ohm

What is the unit for electric power?

• ampere
• volt
• watt
• ohm