Calculating Resistance (, I don't know any physics at all)

[itsastruggle]

Homework Statement

A variable voltage supply is connected in a series circuit with a 10 \Omega resistor and an incandescent bulb.

An anmeter and a voltmeter were used to measure the current flowing through the bulb and the voltage across the bulb. By changing the voltage generated by the variable supply, the following measurements were taken:

Table:
Voltage (V): 1 ; 3.5 ; 5.6 ; 7.2 ; 9 ; 10.5
Current (mA): 60 ; 275 ; 450 ; 550 ; 640 ; 820

(Assume that the incandescent bulb has a linear relationship between its measured voltage and current).

1. How do I use the slope of the graphed data from the table to determine the resistance of the globe?

2. What is an alternative method (not using a graph) to analyse the measured voltage and current data to determine the resistance of the globe?

3. If the globe has a maximum of 12V, and the variable voltage is adjusted so that 12V is measured across the globe. How do you work out what the corresponding current measurement would be?

Homework Equations

Ohm's Law: V=IR

The Attempt at a Solution

--> I have no idea, I'm not familiar with physics at all! :(

 

[berkeman]

Homework Statement

A variable voltage supply is connected in a series circuit with a 10 \Omega resistor and an incandescent bulb.

An anmeter and a voltmeter were used to measure the current flowing through the bulb and the voltage across the bulb. By changing the voltage generated by the variable supply, the following measurements were taken:

Table:
Voltage (V): 1 ; 3.5 ; 5.6 ; 7.2 ; 9 ; 10.5
Current (mA): 60 ; 275 ; 450 ; 550 ; 640 ; 820

(Assume that the incandescent bulb has a linear relationship between its measured voltage and current).

1. How do I use the slope of the graphed data from the table to determine the resistance of the globe?

2. What is an alternative method (not using a graph) to analyse the measured voltage and current data to determine the resistance of the globe?

3. If the globe has a maximum of 12V, and the variable voltage is adjusted so that 12V is measured across the globe. How do you work out what the corresponding current measurement would be?

Homework Equations

Ohm's Law: V=IR

The Attempt at a Solution

--> I have no idea, I'm not familiar with physics at all! :(

Welcome to the PF.

Start by making a table with 3 columns. You are given the data for the first two columns as V and I for the bulb. Fill in the 3rd column with the effective resistance of the bulb (use the Ohm's Law equation that you posted).