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In the circuit shown in Figure 19.60 , find (a) the current in resistor $R,$ (b) the value of the resistance $R,$ and $(\mathrm{c})$ the unknown emf $\mathcal{E}$

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a. $I=2.00 \mathrm{A}$b. $=5 \Omega$c. $\varepsilon=42.0 \mathrm{V}$

Physics 102 Electricity and Magnetism

Chapter 19

Current, Resistance, and Direct-Current Circuit

Electric Charge and Electric Field

Gauss's Law

Electric Potential

Capacitance and Dielectrics

Current, Resistance, and Electromotive Force

Direct-Current Circuits

Electromagnetic Induction

Rutgers, The State University of New Jersey

University of Michigan - Ann Arbor

University of Sheffield

McMaster University

Lectures

10:31

A capacitor is a passive two-terminal electrical component that stores electrical energy in an electric field. The effect of a capacitor is known as capacitance. The electrical charge stored in a capacitor is proportional to the potential difference between its terminals. A capacitor is defined as an electrical component that can store an electric charge. The effect of a capacitor is known as capacitance. The charge on a capacitor is directly proportional to the potential difference across its terminals. The unit of capacitance in the International System of Units (SI) is the farad (F), defined as one coulomb per volt. In electrical engineering, a common symbol for capacitance is the lowercase Greek letter "rho" (?). The capacitance of a capacitor is also expressed in farads.

18:38

In physics, electric flux is a measure of the quantity of electric charge passing through a surface. It is used in the study of electromagnetic radiation. The SI unit of electric flux is the weber (symbol: Wb). The electric flux through a surface is calculated by dividing the electric charge passing through the surface by the area of the surface, and multiplying by the permittivity of free space (the permittivity of vacuum is used in the case of a vacuum). The electric flux through a closed surface is zero, by Gauss's law.

02:43

In the circuit shown in Fi…

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03:20

In the Circuit shown in fi…

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0:00

In the circuit shown in $\…

06:29

07:04

07:38

For the circuit shown in F…

09:48

04:19

The circuit shown in Figur…

04:31

(a) Find the equivalent re…

04:28

05:20

If a $93.5-\mathrm{V}$ emf…

06:06

Find the unknown emf and t…

we are given a circuit that looks like this. Let me try three. The current here is six ampere. The current here is for Ampere. This is 28 ward and this is R No for five days We need to find the resistance through a sister Are because this is four ampere and this is six ampere. The six ampere here gets divided into four and the rest goes over here That which must be six months for two ampere. And this too Ampere goes all the way like this. Who ampere where? It more just with this four ampere on becomes six Ampere, Aggie and the the current through resistance are is to appear now for part B. We want to find out The assistants are We have two unknowns here are on E. So if you want to just find our with him, please to the loop it skips E So we choose the lobe which goes like this now starting well, this 28 we can see that it is 28 using each ofthe law on DH. Then you get to this resistor which is in the direction of current. So that's a minus. I R is six amps times three homes. Then you go over to this resistor, which is where the current is again in the direction. So that's minus I. Our current is two and times that instances are, which is zero. Which gives us you are is equal to 28 minus 18. Implies are is five 0 28 minus eight. It's 10 then, by to his file our is five 45 si we want to find out and salon. So for this we can try to skip our on. We can use simply this loop in the slope. Let's start with F Salon So we have a salon less. Then we get to this resistor where we are in the direction of current. So that's a minus. I R is six times three. Let me get to this a sister again. We are in the direction of the current and some minus. I R is four amps times six home. I'm sorry, this's six form, by the way. This must be equal to zero. Which gives us a salon is six times three eighteen 18. Let's four times 6 24 is it Bordeaux 40 toe hold

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