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Chapter 18: Q11Q (page 755)

Criticize the statement below on theoretical and experimental grounds. Be specific and precise. Refer to your own experiments, or describe any new experiments you perform: 鈥淎 flashlight battery always puts out the same amount of current, no matter what is connected to it.鈥�

Short Answer

Expert verified

The provided statement is false. Current in a circuit changes with change in resistance.

Step by step solution

01

Given data

According to a statement: 鈥淎 flashlight battery always puts out the same amount of current, no matter what is connected to it.鈥�

02

Current in a circuit

The current in a circuit depends on the total resistance of the circuit. More the resistance, lesser the current.

03

Check of the provided statement

A battery can never put out the same amount of current if the load is changed. A battery can only provide a fixed amount of force into the electrons. While passing through each resistance, a part of the energy is lost. Thus the rate of flow decreases.

Hence more number of resistances reduces the current from the same battery. This can be tested by performing an experiment with a battery and multiple resistances. The current can be measured each time the resistance is changed. The observation will be change in current in each case.

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Most popular questions from this chapter

During the initial transient leading to the steady state, the electron current going into a bulb may be greater than the electron current leaving the bulb. Explain why and how these two currents come to be equal in the steady state.

Inside a chemical battery it is not actually individual electrons that are transported from the + end to the 鈥� end. At the + end of the battery an 鈥渁cceptor鈥� molecule picks up an electron entering the battery, and at the 鈥� end a different 鈥渄onor鈥� molecule gives up an electron, which leaves the battery. Ions rather than electrons move between the two ends to support the charge inside the battery.

When the supplies of acceptor and donor molecules are used up in a chemical battery, the battery is dead because it can no longer accept or electron. The electron current in electron per second times the number of seconds of battery life, is equal to the number of donor molecules in the battery.

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Question: A circuit is constructed from two batteries and two wires, as shown in Figure 18.104. Each battery has an emf of 1.3V. Each wire is26cmlong and has a diameter of 7脳10-4m. The wires are made of a metal that has7脳1028mobile electrons per cubic meter; the electron mobility is 5脳10-5(m/s)/(V/m). A steady current runs through the circuit. The locations marked by 脳and labeled by a letter are in the interior of the wire. (a) Which of these statements about the electric field in the interior of the wires, at the locations marked by 脳's, are true? List all that apply. (1) The magnitude of the electric field at location G is larger than the magnitude of the electric field at location F. (2) At every marked location the magnitude of the electric field is the same. (3) At location B the electric field points to the left. (b) Write a correct energy conservation (round-trip potential difference) equation for this circuit, along a round-trip path starting at the negative end of battery 1 and traveling counterclockwise through the circuit (that is, traveling to the left through the battery, and continuing on around the circuit in the same direction). (c) What is the magnitude of the electric field at location B? (d) How many electrons per second enter the positive end of battery 2? (e)If the cross-sectional area of both wires were increased by a factor of 2, what would be the magnitude of the electric field at location B? (f) Which of the diagrams in Figure 18.105 best shows the approximate distribution of excess charge on the surface of the circuit?

In the circuit shown figure 18.108, two thick copper wires connect a 1.5 V battery to a Nichrome wire. Each thick connecting wire is 17 cm long and has a radius of 9 mm. Copper has 8.4脳1028mobile electrons per cubic meter and electron mobility. The Nichrome wire is 8 cm long and has a radius of 3 mm. Nichrome has 9脳1028mobile electrons per cubic meter and electron mobility of 7脳10-5(ms)(Vm).

(a) What is the magnitude of the electric field in the thick copper wire?

(b) What is the magnitude of the electric field in the thin Nichrome wire?
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