Divides are different

A G

Inc.

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Your comfort level with your responses to the following 3 question assessment tool should indicate if the presentation that follows will increase you knowledge base on the topic outlined by the questions in this tool.

Pre-presentation Self Assessment Activity

1. The current divide uses R4 in the numerator of the resistance ratio to determine I4.

Pre-presentation Self Assessment Activity

yes no

2.

3.

R1= 2k ohms

R2= 6k ohms

R3= 2k ohms

R4= 2k ohms

“a”

“c”

V

10Volts

I4 “b”

The voltage divide uses R2+ R3 + R4 in the denominator of the resistance ratio to determine the voltage value at point “b”.

yes no

An equivalent resistance calculation is not needed to determine I4.

yes no

On may occasions you will have to have a sense what a circuit is doing and then why it is doing what it is doing.

The Circuit Divides

Voltage Divide Current Divide

The divides are useful when a qualitative analysis of a circuit or sub-circuit is required

The divides are very useful when a quantitative analysis of a circuit or sub-circuit is needed.

Current Divert

Voltage divide The divides -

What is the voltage value at point “b”?

R1= 2k ohms

R2= 6k ohms

R3= 2k ohms

R4= 2k ohms

“b”

“c”

V

R =5 8k + 2k

(8k)(2k)= ?k Ohms

R1= 2k ohms

R = 5

?k ohms

“b”

“c”

V 1.6k ohms

10Volts 10Volts

= volts =4.44 volts 3.6

16 V

V 1.6k +2k

(1.6k)(10V) = ? volts=

voltage divide

R1 +R5

(R5) (vo)

6k + 2k = 8k

Current Divert The divides -

R1= 2k ohms

R2= 6k ohms

R3= 2k ohms

R4= 2k ohms

“b”

“c”

V

I =1 (1.6k + 2k) ohms

10 volts

10Volts

How much current passes through R4

?

(I1 is the current through R1 and equals all the current flowing through the circuit.)

= ? = (10/3.6) mamps I = 4 3.6

10( )= ?

(6k +2k +2k)

(6k +2k)

I4

2.2 ma

current divert

(R2 +R3 + R4) (I1)

(R2 +R3)

R1= 2k ohms

R = 5

?k ohms

“b”

“c”

V 1.6k ohms

10Volts

This resistance value is the results of an equivalent resistance calculation.

Voltage Divide & Current Divert The divides -

= VR1 + R5

R5 (vo)

volts =4.44 volts 3.6

16= V

R =5 R2 +R3 +R4

(R2+ R3)(R4)

current divert

voltage divide

R1= 2k ohms

R2= 6k ohms

R3= 2k ohms

R4= 2k ohms

“a”

“c”

V

10Volts

I4 “b”

(R1 +R5)I =1

= 2.77 mampsvo

( )(2.77) =2.2 ma10k8k

I = 4

(R2 + R3 ) (I1)

I = 4

( )(R2 +R3 + R4)

The voltage divide splits the voltage values between point “a”, “b” and “c”The current divide actually diverts the current away from the R2, R3 path to the R4 path.

1. The current divide uses R4 in the numerator of the resistance ratio to determine I4.

Post-presentation Self Assessment Activity

2.

3.

R1= 2k ohms

R2= 6k ohms

R3= 2k ohms

R4= 2k ohms

“a”

“c”

V

10Volts

I4 “b”

The voltage divide uses R2+ R3 + R4 in the denominator of the resistance ratio to determine the voltage value at point “b”.

yes no

An equivalent resistance calculation is not needed to determine I4.

yes no

yes no

End of Presentation

A G

Inc.