Problem 8 - University Physics with Modern Physics

Question

Which of the following has the same unit as the electromotive force (emf)? a) current b) electric potential c) electric field d) electric power e) none of the above

Step-by-Step Solution

Answer

a) current b) electric potential c) electric field d) electric power Answer: b) electric potential

Step 1: 1. Recall the units of the given quantities

To identify which of the choices has the same unit as emf, we need to first recall and write down the units for each of the given quantities: - Current (I) is measured in Amperes (A). - Electric potential (V) is measured in Volts (V). - Electric field (E) is measured in Volts per meter (V/m). - Electric power (P) is measured in Watts (W).

Step 2: 2. Write down the units of electromotive force (emf)

Electromotive force (emf) is a measure of the electrical energy that is generated by a device, and its units are Volts (V).

Step 3: 3. Compare the units of emf with the given quantities

Now that we've recalled the units of each given quantity, we can compare them to the units of emf. Electromotive force has units of Volts (V). - Current: Amperes (A) - not the same units as emf - Electric potential: Volts (V) - the same units as emf - Electric field: Volts per meter (V/m) - not the same units as emf - Electric power: Watts (W) - not the same units as emf

Step 4: 4. Choose the option with the same units as emf

We've found that electric potential has the same units as electromotive force (emf). Therefore, the correct answer is: b) electric potential