Practice Emf And Internal Resistance (2.6) - Current Electricity

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10 questions

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6 sample questions

Question 1.
Define EMF.
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What does EMF stand for?
Question 2.
What is internal resistance?
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Think about what happens inside a battery.
3Question 3.
What does EMF stand for?
- Electromagnetic Force
- Electromotive Force
- Electrostatic Force
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Think about what 'EMF' represents in electrical circuits.
4Question 4.
True or False: Internal resistance increases the terminal voltage of a battery.
- True
- False
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Consider what happens to voltage when resistance is involved.
Question 5.
A cell has an EMF of 20V and an internal resistance of 4Ω. If the circuit draws 5A, calculate the terminal voltage and the efficiency of the cell in delivering power.
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Efficiency is power output over power input; consider replacing the battery for better outcomes.
Question 6.
A circuit with two batteries in parallel, each with 9V EMF and 1Ω internal resistance, is used to power a 10Ω resistor. Calculate the total current flowing through the circuit.
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Remember to use the equivalent resistance for parallel combinations!

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