HSC Potential Difference

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A tutorial sheet on the concept of potential difference is given below.

  1. Two wires, one of resistance R and the other of resistance 2R are connected in parallel to a 12 V battery of zero internal resistance. Compare the potential differences across each wire.
  2. Two wires are made of the same material and have the same diameter. One wire has a length L and the other wire a length 2L. Thw wires are connected in series with a 12 V battery. (a) Which wire has a greater potential difference across its ends? (b) Which wire releases the most heat energy in one second?

IB Physics Internal Resistance

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A sheet on topic 6.3 is given below

  1. A battery of emf 6.0 V is connected to an 8 Ω resistor causing a current of 0.5 A to flow. What current flows when a 4 Ω is placed in the circuit?
  2. A battery of emf 12 V has an internal resistance of 2 Ω. The battery is connected to a 6 Ω load resistor. (a) What is the power of the battery? (b) What is the power of the load resistor? [13.5W, 13.5W]
  3. A battery of emf 12 V has an internal resistance r. When the battery is connected to a 8 Ω resistor the power of the 8 Ω is 11.5 W. What is the value of r? [2 Ω]
  4. Is the power of the load resistor always equal to the power of the battery?
  5. Is the power of the internal resistance always equal to the power of the load resistor?