Voltage problems (2 Viewers)

[Twickel]

Hi
In a circuit the power pack is set to 12V the ammeter read 2.0A what would the Voltmeter read. My physics teacher told me its the same as the original Voltage because there is only one resistor. Is that true?

So if its a ohmic resistor e.g a fixed resistor the voltage should be the same, and I should get a straight line graph, if the resistor is non ohmic I get a curve and a different voltage to the one I set on the powerpack.

 

[Forbidden.]

Hi
In a circuit the power pack is set to 12V the ammeter read 2.0A what would the Voltmeter read. My physics teacher told me its the same as the original Voltage because there is only one resistor. Is that true?

So if its a ohmic resistor e.g a fixed resistor the voltage should be the same, and I should get a straight line graph, if the resistor is non ohmic I get a curve and a different voltage to the one I set on the powerpack.

Are you trying to keep the resistance constant ?
Then it should follow the linear relationship which should get you a straight line graph, if not then the resistor is not ohmic.

 

[Twickel]

Say I set the voltage on the powerpack to 10V, with a fixed ohmic resistor the voltmeter should read 10V, if the resistor was non ohmic e.g a light bulb the voltmeter will not read 10V.

Is that right or wrong?

Thanks for the help.

 

[Forbidden.]

Say I set the voltage on the powerpack to 10V, with a fixed ohmic resistor the voltmeter should read 10V, if the resistor was non ohmic e.g a light bulb the voltmeter will not read 10V.

Is that right or wrong?

Thanks for the help.

Using V = IR

It will be 10V and ohmic if:
Current (I) is 1 Ampere and the Resistance (R) is 10 Ohms
or
Current (I) is 10 Amperes and the Resistance (R) is 1 Ohm

You may like to plot a graph of V vs. I.

 

[shannonm]

Say I set the voltage on the powerpack to 10V, with a fixed ohmic resistor the voltmeter should read 10V, if the resistor was non ohmic e.g a light bulb the voltmeter will not read 10V.

Is that right or wrong?

Thanks for the help.

What exactly don't you understand here?
If you have a circuit with a constant voltage source and a resistor, and set a voltage 10V across the resistor, when you probe it with a micrometer the voltage across the resistor will be 10V.
Why do you think this voltage would be something other than 10V if you used a "non ohmic" (also; to help me help you, please tell us what your teacher/textbook defines as non ohmic) light bulb?