Snoopybiggs

[Snoopybiggs]

That’s tricky.

[Snoopybiggs]

The unit 3 video helps alot

[Snoopybiggs]

Number 8 is measured in Watts. And the ^2 is to the power of two. so the number times itself twice. In 8^2 the “2” says to use 8 twice in a multiplication,
so 8^2 = 8 × 8 = 64
In words: 8^2 could be called “8 to the power 2” or “8 to the second power”, or simply “8 squared”

Exponents are also called Powers or Indices.

Some more examples:

Example: 5^3 = 5 × 5 × 5 = 125
In words: 5^3 could be called “5 to the third power”, “5 to the power 3” or simply “5 cubed”
Example: 2^4 = 2 × 2 × 2 × 2 = 16
In words: 2^4 could be called “2 to the fourth power” or “2 to the power 4” or simply “2 to the 4th”

that helped me alot.

[Snoopybiggs]

ok i think I got. can i get reset please 😀

[Snoopybiggs]

Question #7: You’re working on an appliance with the circuit configuration shown below. R1 = 5 ohms. R2 = 32 ohms. If everything is working correctly, what is the expected heat produced by R2?

Incorrect
Your Answer:
About 450 watts
Explanation: P = I^2 * R | you need to use the total circuit current and the resistance of the particular load of interest, in this case, R2.

If you missed this the first time, rewatch the last video in Unit 3, on the heat generated by the loose connection. It’s a very similar scenario.

so 240v at 37 ohms total is 1556 watts?

[Snoopybiggs]

Question #9: In the circuit below, R1 is 5 times greater than the resistance of R2. What are the expected voltage drop readings across R1 and R2?

Incorrect
Your Answer:
R1 will be 120 VAC and R2 will be 600 VAC

Explanation: Remember that in parallel circuits, the voltage SUPPLY to each branch will be the same as the source voltage. Each branch is connected independently to to the source; in effect, parallel branches are independent series circuits. And in any series circuit, the sum of the voltage drops must add up to the source voltage. So with only one load in a series circuit, the voltage drop must equal the source voltage.

So r1 is 120 and r2 is 24? thats not an answer? I think the answer is R1 is 24 and r2 is 120, but thats backwards.

[Snoopybiggs]

so in a parallel circuit r1 cant be 5 times greater because you cant be greater than line voltage.

[Snoopybiggs]

total line voltage is 240

I= E / R

I= 7.5

P= (7.5 x 7.5 = 56.25) + R (32)

P= 1,8000 watts

[Snoopybiggs]

R2 is 5 times greater than R1. L1 voltage is 120. The correct answer is both are 120v? because 5 times R1 is 600 and thats wrong! why. is the 5 times thing a lie. Ive failed these two questins 4 times. theyre gonna kick me out. please help

[Snoopybiggs]

so they’re inversely proportional and Resistance is proportional ?

[Snoopybiggs]

stumped?

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