Question

If each resistor in the circuit shown is 5.0 Ω and the battery is 12.0 V, what does the first voltmeter (V1) read?


(Points : 1)
0.12 V

0.35 V

0.96 V

2.4 V

Answer 1

@hartnn @zepdrix @.Sam. Plllllzzzz help me with this question...i tried and keep getting a huge #...its due tomorrow and I need to get it done :( @Luigi0210 @iambatman @Preetha anyone?

Answer 2

could you find the series current throught the circuit ?

Answer 3

yes, I got 1.8, not sure if that is right though

Answer 4

R2 || R3 = 5 || 5

Req = R1 + R2||R3 + R4

Answer 5

and current I = V/ Req

where V =12
so try again

Answer 6

first tell us what u geot for Req

Answer 7

12.5?

Answer 8

yes
Req = 12.5
now find I

Answer 9

0.96

Answer 10

yes, I = 0.96A
this currrent will flow through the parallel combination of R1 and R2

Answer 11

i meant R2 and R3

so, the voltage across it will be

V1 = I times (R2||R3)

Answer 12

is that 0.96 * (5/2) = 2.4?

Answer 13

correct! :)

Answer 14

aw yea :) awesome

Answer 15

I have one more question that I needed help with. I would really appreciate if you could help me with it, but if not its ok :)

Answer 16

sure, its ok :)

Answer 17

ok, cool :) one sec

Answer 18

For the circuit shown, what is the power dissipated by R3?


(Points : 1)
2.0 W

2.5 W

2.8 W

5.2 W

Answer 19

could you find the voltage across R3 ?
use the exact same method we discussed above

Answer 20

So, I find I first and then instead of using R2||R3, just R3? Does that work?

Answer 21

why just R3 ? use R2||R3 only

its the same circuit , with numbers changed!

Answer 22

oh, ok :) I will try

Answer 23

i got 145.3...

Answer 24

for what ?

Answer 25

for voltage

Answer 26

but I think that might be wrong

Answer 27

yeah try again

Answer 28

Req = 8.5+3.2 + 13 || 18

I = 15/ Req

V_18 = I * (13||18)

Answer 29

I keep getting 19.2 for I

Answer 30

Power dissipated = V_18 ^2/ 18

Answer 31

Req = ... ?

Answer 32

7.5

Answer 33

1/13 + 1/18 = 1/R ---> 31/234 = 1/R ----> 234/31 = R...or am I making a mistake?

Answer 34

thats just 13||18

Req is actually = 8.5+3.2 + 13 || 18

Answer 35

So Req is 19.2

Answer 36

and current I ?

Answer 37

current = 0.78125-----but that gives me Power dissipated to be 5.9...which isn't an option

Answer 38

how....

thats just the current through entire circuit, not through that resistor

Answer 39

we need to find the voltage across the resistor

Answer 40

oh, ok, that makes sense

Answer 41

V_18 = I * (13||18)

Answer 42

i used your formula V_18^2/18 and got 1.93...is that the right thing?

Answer 43

yeah, correct!
nearest option is 2

Answer 44

ok :) awesome!!! Thank you SOOOO much for helping me :)

Answer 45

welcome ^_^

Answer 46

@Daniellelovee

Answer 47

@Directrix