An underwater ocean research probe is powered by a small thermoelectric generator (TEG) that drives a sonar transmitter.
State the equation that links current (III), potential difference (VVV), and power (PPP).
When the thermoelectric generator is active, a potential difference of 8.0 V8.0\text{ V}8.0 V is maintained across its terminals, producing an electrical power output of 5.6 W5.6\text{ W}5.6 W.
Calculate the current generated.
State the equation that links efficiency, total power input, and useful power output.
The electrical power from the generator is used to run the sonar transmitter. The transmitter has a total power input of 2.5 W2.5\text{ W}2.5 W and operates at an efficiency of 0.720.720.72.
Calculate the useful acoustic power output of the transmitter.
Practise AQA GCSE Physics Conservation and dissipation of energy with exam-style questions for Foundation and Higher tier. 29 questions covering Energy transfers in a system and Efficiency, matched to the AQA GCSE Physics (8463) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.