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Chapter 21: Q13CQ (page 771)

Is every emf a potential difference? Is every potential difference an emf? Explain.

Short Answer

Expert verified

Every emf is a potential difference.

Step by step solution

01

Step 1:Definition of emf

Electromotive force is the energy provided by a cell or battery per coulomb of charge passing through it, it is measured in volts. It is the potential difference across the cell when no current is flowing.

02

What is the potential difference?

Emf remains constant and it can be looked at as a 'cause'.

The potential difference is the amount of work to be done to move a unit positive charge from one point to another. It is also measured in volts.

But the main difference is that it does not have to remain constant and that it is considered as a 'result'.

From this, it can be concluded that every emf is the potential difference that is measured in the open circuit.

Yes, every emf is a potential difference.

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Most popular questions from this chapter

Suppose you measure the terminal voltage of a 3.200-Vlithium cell having an internal resistance of5.00惟by placing a1.00-k惟voltmeter across its terminals. (a) What current flows? (b) Find the terminal voltage. (c) To see how close the measured terminal voltage is to the emf, calculate their ratio.

A \(160 - \mu F\)capacitor charged to \(450\;V\)is discharged through a \(31.2 - k\Omega \)resistor. (a) Find the time constant.(b) Calculate the temperature increase of the resistor, given that its mass is \(2.50\;g\)and its specific heat is \(1.67\frac{{kJ}}{{kg{ \cdot ^\circ }C}}\), noting that most of the thermal energy is retained in the short time of the discharge. (c) Calculate the new resistance, assuming it is pure carbon. (d) Does this change in resistance seem significant?

Why is the power dissipated by a closed switch, such as in Figure 21.43, small?

(a) What is the internal resistance of a voltage source if its terminalvoltage drops by 2.00 V when the current supplied increases by 5.00 A?(b) Can the emf of the voltage source be found with the information supplied.

Figure 21.55 shows how a bleeder resistor is used to discharge a capacitor after an electronic device is shut off, allowing a person to work on the electronics with less risk of shock. (a) What is the time constant? (b) How long will it take to reduce the voltage on the capacitor to 0.250%(5% of 5%) of its full value once discharge begins? (c) If the capacitor is charged to a voltage V0 through a 100-惟 resistance, calculate the time it takes to rise to 0.865V0 (This is about two-time constants.)
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