Divides are different A G Inc. Click within the blue frame to access the control panel. Only use the control panel (at the bottom of screen) to review what you have seen. This presentation is partially animated. When using your mouse, make sure you click only when it is within the blue frame that surrounds each slide.

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 R 4 in the numerator of the resistance ratio to determine I 4. Pre-presentation Self Assessment Activity yesno R 1 = 2k ohms R 2 = 6k ohms R 3 = 2k ohms R 4 “a” “c” D V 10Volts I 4 “b” The voltage divide uses R 2 + R 3 + R 4 in the denominator of the resistance ratio to determine the voltage value at point “b”. yesno An equivalent resistance calculation is not needed to determine I 4. yesno

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 DivideCurrent 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”? R 1 = 2k ohms R 2 = 6k ohms R 3 = 2k ohms R 4 “b” “c” D V R = 5 8k + 2k (8k)(2k) = ?k Ohms R 1 = 2k ohms R = 5 ?k ohms “b” “c” D V 1.6k ohms 10Volts = volts =4.44 volts D V D V 1.6k +2k (1.6k) (10V) = ? volts = voltage divide R 1 +R 5 (R 5 ) ( v o ) 6k + 2k = 8k

Current Divert The divides - R 1 = 2k ohms R 2 = 6k ohms R 3 = 2k ohms R 4 “b” “c” D V I = 1 (1.6k + 2k) ohms 10 volts 10Volts How much current passes through R 4 ? (I 1 is the current through R 1 and equals all the current flowing through the circuit.) = ?= (10/3.6) mamps I = ( ) = ? (6k +2k +2k) (6k +2k) I ma current divert (R 2 +R 3 + R 4 ) ( I 1 ) (R 2 +R 3 ) R 1 = 2k ohms R = 5 ?k ohms “b” “c” D V 1.6k ohms 10Volts This resistance value is the results of an equivalent resistance calculation.

Voltage Divide & Current Divert The divides - = D V R 1 + R 5 R5R5 (v o ) volts =4.44 volts = D V R = 5 R 2 +R 3 +R 4 (R 2 + R 3 )(R 4 ) current divert voltage divide R 1 = 2k ohms R 2 = 6k ohms R 3 = 2k ohms R 4 “a” “c” D V 10Volts I 4 “b” (R 1 +R 5 ) I = 1 = 2.77 mamps vovo ( )( 2.77 ) =2.2 ma 10k 8k I = 4 (R 2 + R 3 ) (I1) (I1) I = 4 ( ) (R 2 +R 3 + R 4 ) The voltage divide splits the voltage values between point “a”, “b” and “c” The current divide actually diverts the current away from the R 2, R 3 path to the R 4 path.

1. The current divide uses R 4 in the numerator of the resistance ratio to determine I 4. Post-presentation Self Assessment Activity R 1 = 2k ohms R 2 = 6k ohms R 3 = 2k ohms R 4 “a” “c” D V 10Volts I 4 “b” The voltage divide uses R 2 + R 3 + R 4 in the denominator of the resistance ratio to determine the voltage value at point “b”. yesno An equivalent resistance calculation is not needed to determine I 4. yesno yesno

End of Presentation A G Inc.