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Terminal voltage and internal resistance

  • Thread starter dev-hud
  • Start date
  • #1
16
0
A battery labeled 12.0 V supplies 1.90 A to a 6.00 ohm resistor

A) what is the terminal voltage of the battery?

B) What is its internal resistance


V = 12.0
R = 6.00
I = 1.90

I think i am to use V = emf - IR for terminal voltage right? however i do not know how to get emf, and IR is current x resistance right? i got the equation off google and it didnt explain so i am assuming? i am stuck on both a and b
 

Answers and Replies

  • #2
648
2
12V is the emf.
emf - IR will give you the so called "lost" volts. That is the voltage "used up" on the internal resistance.
 
  • #3
3,741
418
A battery labeled 12.0 V supplies 1.90 A to a 6.00 ohm resistor

A) what is the terminal voltage of the battery?

B) What is its internal resistance


V = 12.0
R = 6.00
I = 1.90

I think i am to use V = emf - IR for terminal voltage right? however i do not know how to get emf, and IR is current x resistance right? i got the equation off google and it didnt explain so i am assuming? i am stuck on both a and b
The 12 V is the emf. The battery is labeled with its emf.
 

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