• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

EMF and Internal Resistance of a cell

Extracts from this document...


EMF and Internal Resistance of a cell

Data Collection

Current (A) ± 0.005

Voltage (V) ± 0.05











Data Processing and Presentation

Largest values of E and –r

Smallest values

...read more.














The equation E = V + Ir can be rearranged

E = V + Ir

V = E – Ir

V = –Ir + E

V = (–r) I + E

This allows us to plot V as y against I as x, in order to find the values of E and –r. Because the equation is now in the format y = mx + c, we know that E will be the y-intercept value, and –r will be the gradient.

I plotted three sets of data for current and voltage: my original results, the values including uncertainties that would give the largest values of E and –r, and the values including uncertainties that would give the smallest values of E and –r.


...read more.


The variable resistor was not given time to cool down in between our recordings, so the temperature might’ve affected the results in some way. I only obtained five results, which might not have been enough for the experiment to really be considered accurate. Next time, I will record more paired values of the current and the voltage, as well as repeat the experiment at least once to reduce the chance of inaccuracy.

...read more.

This student written piece of work is one of many that can be found in our International Baccalaureate Physics section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related International Baccalaureate Physics essays

  1. Electromotive Force and Internal Resistance of a cell

    Second reason is the thermal factor. When we increased the resistance of the Resistor, the current got lower and the Resistor got hotter. In other words, increasing resistance caused increasing temperature and then more increasing resistance. The last reason is that the clip bridging the main wire to the Resistor was not a good conductor.

  2. Suspension Bridges. this extended essay is an investigation to study the variation in tension ...

    This happens because as the elasticity of the string increases, it stretches and therefore, the tension force is also spread about a wider area. Relation of tension to the strain values of strings The strain values have been calculated in the previous section and it is found out that ?nylon < ?band .

  1. design of a variable resistor

    Ammeter (amp) Voltage (V) Resistance (Ohm) 4.8 0.3 0.0625 4.85 0.3 0.06185567 4.9 0.3 0.06122449 Testing a copper wire with diameter of 2nd Experiment Diameter ( mm) Ammeter (amp) Voltage (V) Resistance (Ohm) 4.75 0.3 0.06315789 4.8 0.28 0.05833333 5 0.23 0.046 Testing a copper wire with diameter of 3rd experiment Diameter ( mm)

  2. Investigating the induced emf with the number of windings and different heights

    Method 1 - Connecting the coil to the data logging program on the computer - Configure the computer to measure volt against time - Equip the coil of windings to a stand - Measure a height which will be kept constant under the experiment - Drop a magnet from the exact height every time, through the coil of wire.

  1. HL Physics Revision Notes

    Consider the light that leaves the slit at an angle ?, the path difference between wave 1 and wave 2 is dsin? and if this is equal to an integral number of wavelengths then the two waves will interfere constructively in this direction, similarly wave 2 will interfere constructively with

  2. How does the sinkage depth of a tyre affect its rolling resistance ?

    Method of investigation The method of investigation was designed in a way to reduce the possibilities of errors to its lowest potential while at the same time keeping in mind the attainment of highest accuracy of the results . The method involved allowing a bicycle with training wheels to roll

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work