IB Physics HL B 5 5 Electrical Power Questions

Practise IB Physics HL B.5.5 by calculating circuit power, AC RMS power and I²R transmission losses.

Exam points

Select and apply P=IV, P=I^2R or P=V^2/R to calculate power in components and complete circuit networks, including series, parallel and variable-resistance cases.
Convert between peak and rms current or voltage and calculate average power in AC resistors, using the equivalent-DC meaning of an rms value.
Calculate transmission-line power loss and explain why step-up transmission uses high voltage and lower current to reduce I^2R heating.
Determine power, energy-per-second, efficiency or safe operating limits for motors, heaters, lamps, cells and resistors from the stated circuit constraints.

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Study B.5.5—Electrical power conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

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The plates in (c) are replaced by a cell that has an emf of 12.0 V and internal resistance $5.00 \Omega$ . A resistor of resistance R is connected in series with the cell. The energy transferred by the cell to an electron as it moves through the resistor is $1.44 \times 10^{-18} \mathrm{~J}$ .

Calculate the total power supplied by the cell.

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IB Physics HL B 5 5 Electrical Power Questions question 1