2.2 Electric current and potential difference

Potential difference between any two points is measured in:

• volts
• joules
• coulombs
• none of these

The voltmeter is an instrument used to measure __________.

• potential difference
• kilowatt-hour
• overloading
• negative, positive

Tags

NGSS.HS-PS2-5

Resistance is measured in ___. 

• watts. 
• amps.
• ohms.
• volt

What is the formula for resistance?

• R = V x I
• R = V/I
• R = I/V
• R = V + I

How many volts would we need to produce a current flow of 8 A through a 6 Ω resistor

• 12 V

• 24 V

• 1.33 V

• 48 V

If the battery produced 12.6 V and what would be the current flow be for a 6 Ω resistor

• 2.1 A

• 2.4 A

• 1.71 A

• 15 A

What size resistor would produce a 3 A current flow with a 12 V battery

• 1 Ohm

• 3 Ohms

• 4 Ohms

• 12 Ohms

A set of electric trains are powered by a 9V battery. What is the resistance of the trains if they draw 3.0 A of current? 

• 27 Ω
• 0.03 Ω
• 2.7 Ω
• 3 Ω

The thicker wire has low resistance because ......... electric charges can flow through it.

• Same number

• Less

• More

Which of the graph obey the Ohm's Law

• 
• 
• 
•