A pool filled with non-newtonian fluid

Click below if your school blocks YouTube

pool filled with non-newtonian fluid.mov

 

 

You can make this fluid

with 2 ingredients found

 in any kitchen!!


 

 

 

 

It is nothing more than

water & cornstarch! It

solidifies with pressure.

 


 

 

Total Resistance Parallel Circuit

 

Circuits & Total Resistance - Flash

[ HTML5 ]
St. Mary's H.S.

 

Learning-Connections Clipart

 

 

 

Deriving an Equation for Total Resistance

 

Since IT = I1 + I2 + I3 + I4 +……

Then …

VT = V1 + V2 + V3
RT R1 R2 R3

 

On Reference Table

1 = 1 + 1 + 1
RT R1 R2 R3

 

 

RT - Total Resistance

A.K.A.

"Equivalent Resistance"
"Combined Resistance"
"Effective Resistance"

 

 


 

Ex 3) Find the total resistance for 3 resistors of 2.0 ohms, 5.0 ohms and 2.0 ohms connected in parallel.

 

1 = 1 + 1 + 1
RT R1 R2 R3

1 = 1 + 1 + 1
RT 2.0 Ω 5.0 Ω 2.0 Ω

 

Find common denominator and solve 

1/RT = 5/10 Ω + 2/10 Ω + 5/10 Ω

 

1/RT = (5 + 2 + 5)/10

 

1/RT = 12/10

 

RT = 10/12 ohms

 

RT = .83 ohms


 

 

 

 


** The more resistors
 connected in parallel
the smaller the total resistance!!!

 

Circuits & Total Resistance

[ HTML5 ]
St. Mary's H.S.

 

Why?

 

Every time you add a resistor in parallel,

 

you add another branch for current,

 

so you create more current.

 

This reduces the total R

 

 

Total Resistance Equation #2
for parallel circuit

 

RT = VT/IT

 

 

 

 

 

 

Ex 4) Resistors of 3.0 Ω, 6.0 Ω, 9.0 Ω are connected in parallel.

 

Find combined R

 

1 = 1 + 1 + 1
RT R1 R2 R3

1/RT =

 

1/3.0 Ω + 1/6.0 Ω + 1/9.0 Ω

 

(common denominator, 18)

 

 = (6.0 + 3.0 + 2.0)/18. = 11./18.

 

 

 

RT = 18./11. Ω

 

 

 

 

 

 

 

 

 

 = 1.6 ohms

 

 

 

 

 

 

 

Ex. 5)

a) Find the equivalent resistance for this parallel circuit

 

1 = 1 + 1 + 1
RT R1 R2 R3

 

1/RT  = 1/2.0 Ω + 1/4.0 Ω

 

1/RT = 3.0 Ω/4.0 Ω

 

RT =4.0 Ω/3.0 Ω

 

= 1.3 ohms

 

 

b) Find IT (Current coming out of the source)

 

 

 

VT  = ITRT

 

 

12. V = IT(1.3 ohms)

 

IT = 9.0 amps

 

 

 

c) Find the potential drop (V) across R1 & R2 

 

VT = V1 = V2 = V3

 

 

VT = V1 = V2 = 12V 

 

 

 

 


 

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