You measured the emf of the model battery with a multimeter. Why should this give you...

You measured the emf of the model battery with a multimeter. Why should this give you an accurate measurement of emf , considering that the battery has an internal resistance?

Expert Solution

The model battery is a voltage source with a internal resistance in series. When the battery is delivering no current, there is no current through this internal resistance, and therefore the voltage drop by it is 0. The open circuit voltage of a battery is therefore the same as its internal voltage.

When we put a load on the battery, current flows, the internal resistance drops some voltage, and the external voltage is then less than the internal voltage.

When we are measuring voltage with a multimeter it works as voltmeter.Voltmeters have high impedance (infiity for ideal voltmeter). Since voltmeter is connected in parallel with the element whose voltage is going to be measured so they present very low load to the battery that can be ignore for practical purposes. Therefore the internal and external voltages of the battery are same for practical purposes when measured with a multimeter.

Thus this give us an accurate measurement of emf.

* emf is a specific term used to describe a voltage generated by a battery.

genius_generous answered 2 years ago

In the circuit of Figure P32.48, the battery emf is 80 V, the resistance R is...

In the circuit of Figure P32.48, the battery emf is 80 V, the resistance R is 240 , and the capacitance C is 0.500 µF. The switch S is closed for a long time, and no voltage is measured across the capacitor. After the switch is opened, the potential difference across the capacitor reaches a maximum value of 150 V. What is the value of the inductance L?

A damaged car battery with an emf of 11.4 V and an internal resistance of 0.01...

A damaged car battery with an emf of 11.4 V and an internal resistance of 0.01 ohms is connected to a load of 2.0 ohms. To help the battery, a second battery with an emf of 12.6 V and an internal resistance of 0.01 ohms is connected by jumper cables to the terminals of the first battery. Draw a diagram for the circuit. Find the current in each part of the circuit. Find the power delivered by the second battery.

Three resistors of 20, 50 and 60 ohms are connected to a battery having an emf...

Three resistors of 20, 50 and 60 ohms are connected to a battery having an emf of 15 volts. Draw the circuit diagram and determine the total resistance, the total and individual currents, total and individual voltages if the resistors are connected in series.

difference between terminal potential difference and emf. Are these values fixed for a given battery or...

difference between terminal potential difference and emf. Are these values fixed for a given battery or can they change? explain why

An old car battery that has an emf of e m f1 = 11.5 V and...

An old car battery that has an emf of e m f1 = 11.5 V and an internal resistance of 55.0 mΩ is connected to an R = 2.00 Ω resistor. In an attempt to recharge the battery, you connect a second battery that has an emf of e m f2 = 12.6 V and an internal resistance of 10.0 mΩ in parallel with the first battery and the resistor with a pair of jumper cables. (a) Draw a diagram...

Keynesian model vs Classical model Explain why you agree with the Keynesian model. Give detailed reasons...

Keynesian model vs Classical model Explain why you agree with the Keynesian model. Give detailed reasons why you agree with three specific principles in the model. Focus on the ideas that are realistic, meaning you observe that the principle is true in real life. Explain why you disagree with the Classical model. Give detailed reasons why you disagree with Choose three specific principles in the model that you disagree with. Give detailed reasons why you disagree with these three principles....

The spectrometric measurement of calibration solution and unknown should be measured at the same time. Give...

The spectrometric measurement of calibration solution and unknown should be measured at the same time. Give reason(s) for this?

One of the important features of a camera is the battery life as measured by the...

One of the important features of a camera is the battery life as measured by the number of shots taken until the battery needs to be recharged. The data shown in the table below contain the battery life of 10 subcompact and 10 compact cameras. Complete parts (a) through (c). Subcompact 49 50 25 28 31 33 39 57 47 57 Compact 70 30 60 35 55 39 59 46 52 68 . Assuming that the population variances from both...

A battery with a potential difference of V connects to a resistor, and the resulting current is measured. You remove the battery, and a new battery with a potential difference of 2V is put in its place. As a result,

Question 2 of 20 Current is caused by voltage differences. resistance. capacitance. none of the above. Question 3 of 20 A battery with a potential difference of V connects to a resistor, and the resulting current is measured. You remove the battery, and a new battery with a potential difference of 2V is put in its place. As a result, the current will double. the resistance will double. both the current and the...

Consider the circuit shown in the following figure. The battery has emf 50.0 V and negligible internal resistance.

Consider the circuit shown in the following figure. The battery has emf 50.0 V and negligible internal resistance. R2 = 3.00 Ω, C1= 3.00 μF, and C2= 6.00 μF. After the capacitors have attained their final charges, the charge on C1 is Q1 = 15.0 μC. A) What is the final charge on C2? B) What is the resistance R1?

Question