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Flashcards in Circuit Deck (17):
1

Thevinen Equivalent voltage

 

Vab=12Ω/(12Ω+4Ω)x12Volts

2

Two parallel flat plates are separated by 2cm. A voltage of 500 V is applied to the parallel plates. What is the maximum electric field force experienced by an electron passing between the plates?

E=V/d

F=qE

q=1.6*10-19

3

the rms current through the 45-ohm resistor in the circuit shown is

Vrms=Vmax/√2

Xc=1/ŵC

Find I

4

the current in the 100 ohm resistor is

first solve first loop:

ZP=(N1/N2)2Zs

and then find I=V/R

and then Is=(N1/N2)*IP

4

A copper conductor 10 m long and 3mm in diameter has a resistance of 0.024 ohms at room temperature (20C). What is the temperature in degrees Celsius if this conductor has a resistance of 0.036 ohms? (=0.0039)

R=R0{1+(T-T0)}

solve for T=148

5

the instantaneous current through the inductor at t=0.001 sec in amperes is

fin I=15V/10Ω=1.5A

T=L/R=0.0025/10

I=I+(I0-I)e-t/T

6

8 bit output

28= 256

7

When one system interacts with another system wich of the following is possible?

work can occur by one system inducing a force on the other system

8

A solid is a good electrical conductor if

the conduction band is half full

9

the rms voltage across the 40-ohm resistor is, in volts:

I=50/(40+30j)

10

Isolated system

the heat transfer is zero

not interact with its surroundings.

11

Power

P=I2R

12

An A/D converter has a range of -5V to 5V and 8 bit output. An output of 01101100 corresponds approximately to what input voltage?

28=256

voltage range (-5V to 5V)=100

10/256= 0.0391 volts/steps

 01101100=108 steps

0.0391 volts/steps*108 steps=4.228

-5V+4.228= -0.7772 volts

13

A/D

analog-to-digital

14

Two parallel conductors carry 50 amperes each in the same direction. The conductors are 5 cm apart. What is the magnetic force on 1 meter length of one conductor in newtons?

F=IL*B

B=uI/(2πr)

15

the instantaneous voltage across the inductor 

VL=LdI/dt

16

The power delivered by the 12 volt battery, above, in watts, is:

Power= V I

I=V/Ω

Find I loop1+I loop2=I