A heat engine works between reservoirs at $600 K$ and $300 K$ . What is the largest possible efficiency?

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What current flows through a resistor of $4 Ω$ when $12 V$ is applied?
Two resistors of $6 Ω$ and $3 Ω$ are connected in parallel. What is the total resistance?
A device runs on $230 V$ and draws a current of $2 A$ . What is its power?
In a series circuit with three bulbs, one bulb burns out. What happens to the other bulbs?
A transformer's primary coil has $1000$ turns at $230 V$ , and the secondary coil has $100$ turns. What is the secondary voltage?
A capacitor of $2 μ F$ is charged to $10 V$ . How much energy is stored in it?

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