ET145 AC El€ctronicsSeries Reslstive Circuits

Measuring AC Voltages Lab

For the circuit shown, calculate the following voltage and current ydues.Enter your results in the table below. Show ALL Work

Vin

8 V1 0kHz0Deg

Peak RMS

Calculations:

Vnz :

Vns :

V r :

Vs :

Vc :

11 -

Vnr :

I r -

Vnr :

Vnz =

Vrc :

V l =

Vn :

Vc=

Procedure:

Vin

8 V1 OkHz0Deg

fru.,l-------'8fr'?'

A

8T145 AC ElectronicsSeries Resistive Circuits

Measuring AC Voltages Lab

I r =

Vnt =

VRz :

Vnr =

- rric+ " -_

. - - . j L . b + F . . j - + . *:--

c

l .

2.

Build the circuit as shown on your breadboard.

Measure the indicated currents and voltages using your DMM.Enter your results in the table below. Remember, Your DMM Measures AC Values in RMS.

Measure the voltages, using your oscilloscope, at point A, B, and C with respect to ground.

Measure the voltage drops across the resistors using your oscilloscopeEnter your results in the table below.(O-Scope)

Remember, Resistors to be measured must be at ground.

(Dndn/r)

3.

4.

V l =

V s :

V c :

Vnr :

Vnz :

Vnr =

Do your measured values support your calculated values?

I)emonstrate to your instructor measuring AC voltages in the completed circuit.Instntctors Initials

1 .

ET 145 - AC ElectronicsHomework # 3

Chapter # 9: Capacitance

A capacitor consists of two separated by a

a. insulators - dielectricb. dielectrics - insulatorc. insulators - conducting Plated. conducting plates - dielectric

The insulator material used in a capacitor is called the '

a. fillerb. corec. dielectricd. conduction band

Capacitance is measured in - .

a. Henrysb. Faradsc. Ohmsd. the lab

If a charge of 100 pC produces a l0 volt potential across a capacitor, what is the value of the capacitor ?

a . l 0Fb. 10 mFc. l0 pFd. 100 pF ,

A 680 pF capacitor has a voltage of 2|volts across it. What is its charge in coulombs ?I

a. 27.2 pCb. 36.76 GCc. 17 pCd. 17 nC

Determine the voltage across a 470 pF capacitor that is storing 5mC of charge.

a. 10.64 kVb. 10.64 vc. 94 mVd. 10.64 mV t

Which of the following -at"rials has the highest dielectric constant (er) ?

a. Airb. Micac. Teflond. Glass

2.

3 .

4.

5 .

6.

7.

t

ET 145 - AC ElectronicsHomework # 3

Chapter # 9: Capacitance

8. Convert 47 nF to microfarads.

a. .47 1tFb. .047 pFc. .0047 pFd.470 pF

9. which of the following tlpes of capacitors is electrolytic ?

a. Mica capacitorsb. Ceramic capacitorsc. Plastic-Film capacitorsd. Tantalum capacitors

10. Multiple capacitors io ,"ri., combine like resistors in

a. seriesb. parallelc. complex circuitsd. water

t l. Multiple capacitors in parallel combine like resistors in .

a. series' b. parallel

c. complex circuitsd. water

12. when capacitors are connected in series, total capacitance

a. rncreasesb. decreasesc. remains the samed. is impossible to determine

13. when capacitors are connected in parallel, total capacitance

a. increasesb. decreasesc. remains the samed. is impossible to determine

t

1

14. What is the total capacitance of a 2700 pF and a 1800 pF capacitor connected in series ?

a. 4.5 rnFb. 4.5 pFc. 1.08 pFd. 1.08 nF

t

I

15 .

ET 145 - AC ElectronicsHomework # 3

Chapter # 9: Capacitance

Calculate the total capacitance when the following capacitors are connected in parallel:Cr : 270 pF, Cz= 330 pF, and C3 = 470 pF

a. 112.8 pFb. I12.8 nFc. 1.07 pFd. 1.07 nF

Calculate the total capacitance when the following capacitors are connected in series:Cr : 270 pF, Cz = 330 pF, and C3 = 470 pF

a. 112.8 pFb. 112.8 nF 'c. 1.07 pFd. 1.07 nF

If following capacitors are connected in serieS, Cr = 270 pF, Cz :330 pF, and Cs = 470 pF,whichcapacitor will drop the most voltage?

a. Cr : 270 pFb. Cz:330 pFc. C: : 470 pFd. Impossible to determine

If following capacitors are connected in series with a25 Y supply voltage: Cr = 270 pF, Cz:330 pF, andCr = 470 pF, how much voltage is dropped across the 330 pF capacitor?

a. r0.44v Ib .6vc. 341.82 mVd. 8.ss v

If following capacitors are connected in parallel with a25 Y supply voltage: Cr = ZIO pf , Cz=330 pF,and C: = 470 pF, how much voltage is dropped across the 330 pF capacitor?

a. 25Vb. t0.44vc. 8.55 V td . 6v 1

A capacitor appears as an open to a constant D.C. source, and appears as a short to an AC source.

a. Trueb. False

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