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Chapter 26: Problem 8

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

Short Answer

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

Step by step solution

01

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).
02

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).
03

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
04

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

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Most popular questions from this chapter

A battery, a resistor, and a capacitor are connected in series in an RC circuit. What happens to the current through a resistor after a long time? Explain using Kirchhoff's rules.

You wish to measure both the current through and the potential difference across some component of a circuit. It is not possible to do this simultaneously and accurately with ordinary voltmeters and ammeters. Explain why not.

A resistor and a capacitor are connected in series. If a second identical capacitor is connected in series in the same circuit, the time constant for the circuit will a) decrease. b) increase. c) stay the same.

The ammeter your physics instructor uses for in-class demonstrations has internal resistance \(R_{\mathrm{i}}=75 \Omega\) and measures a maximum current of \(1.5 \mathrm{~mA}\). The same ammeter can be used to measure currents of much greater magnitudes by wiring a shunt resistor of relatively small resistance, \(R_{\text {shunt }}\), in parallel with the ammeter. (a) Sketch the circuit diagram, and explain why the shunt resistor connected in parallel with the ammeter allows it to measure larger currents. (b) Calculate the resistance the shunt resistor has to have to allow the ammeter to measure a maximum current of 15 A.

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