AaronAndyson
  • AaronAndyson
http://prntscr.com/8ie2s0
Physics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
zzr0ck3r
  • zzr0ck3r
that looks like Chinese to me.
AaronAndyson
  • AaronAndyson
Okay.I'll type the question.
AaronAndyson
  • AaronAndyson
Three resistors are connected in parallel.Draw a circuit including a switch and a battery . Derive the equivalent resistance of such a circuit.

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More answers

AaronAndyson
  • AaronAndyson
@zzr0ck3r You there?
zzr0ck3r
  • zzr0ck3r
nono I am saying I don't know the subject...
zzr0ck3r
  • zzr0ck3r
lol
AaronAndyson
  • AaronAndyson
@welshfella @Abhisar
Abhisar
  • Abhisar
Do you know anything about Ohm's law?
AaronAndyson
  • AaronAndyson
Yep.
Abhisar
  • Abhisar
Good, so lets's start. I'll leave part (a) for you.
AaronAndyson
  • AaronAndyson
Actually,I got part(b) also.
AaronAndyson
  • AaronAndyson
Stcuk at part(c)
AaronAndyson
  • AaronAndyson
Stuck*
Abhisar
  • Abhisar
Ok, current in the circuit can be calculated by using the formula, \(\sf \boxed{\Large I=\frac{Emf}{r+R}}\)
Abhisar
  • Abhisar
r=internal resistance, R=external resistance
AaronAndyson
  • AaronAndyson
Curent = 0.06A?
AaronAndyson
  • AaronAndyson
0.096*
Abhisar
  • Abhisar
Yes.
AaronAndyson
  • AaronAndyson
I've no idea how to go about the rest :(
Abhisar
  • Abhisar
Potential difference across each resistor: You know the current flowing (I) now. use V=IR for each resistor. E.g. across 20 ohms resistor voltage drop will be 0.096*20
AaronAndyson
  • AaronAndyson
0.96*2?
Abhisar
  • Abhisar
WHat?
AaronAndyson
  • AaronAndyson
1.92V?
AaronAndyson
  • AaronAndyson
p.d across 20 ohm resistor is 1.92?
Abhisar
  • Abhisar
YEs.
AaronAndyson
  • AaronAndyson
and the latter is 0.48?
AaronAndyson
  • AaronAndyson
i.e across the 5 ohm resistor.
Abhisar
  • Abhisar
Yes
AaronAndyson
  • AaronAndyson
and across the cell?
Abhisar
  • Abhisar
Ok, let's do the last one first... When the current is flowing, then the potential difference between the terminals of the cell < EMF and that potential drop V is given by, V= (emf of the cell) - Current X internal resistance. V= 2.5 - 0.096 X 1
Abhisar
  • Abhisar
Getting it? This is the solution for last one....
AaronAndyson
  • AaronAndyson
wait what?
AaronAndyson
  • AaronAndyson
that should be the p.d across the cell...
Abhisar
  • Abhisar
Nuuu...I explained it wrong earlier....chuck that from ur mind..
Abhisar
  • Abhisar
Is it clear now???
AaronAndyson
  • AaronAndyson
OK!
AaronAndyson
  • AaronAndyson
so p.d across the cell is?
Abhisar
  • Abhisar
Recall what we did to find the pd across resistors??? We multiplied their individual resistances with current flowing..Right?
AaronAndyson
  • AaronAndyson
Yep.
Abhisar
  • Abhisar
Similarly, to find pd across the cell we will multiply the current with resistance of cell i.e. internal resistance...
Abhisar
  • Abhisar
Can you find it for me?/
AaronAndyson
  • AaronAndyson
You mean 2.5*1?
Abhisar
  • Abhisar
What's the current?
AaronAndyson
  • AaronAndyson
0.096*2.5 = p.d across the cell?
Abhisar
  • Abhisar
Nuu..Current X Internal resistance....
Abhisar
  • Abhisar
Current = ? Internal resistance = ?
AaronAndyson
  • AaronAndyson
Ugh...idk...... :'(
AaronAndyson
  • AaronAndyson
Internal resistance = 1 ohm
Abhisar
  • Abhisar
Internal resistance is given in the question and we calculated the current in 1st part :O
AaronAndyson
  • AaronAndyson
I know...Zoned out xD
AaronAndyson
  • AaronAndyson
Current is 0.096A and Internal Resistance is 1 ohm
AaronAndyson
  • AaronAndyson
Voltage drop = current*internal resitance right?
AaronAndyson
  • AaronAndyson
resistance*
Abhisar
  • Abhisar
Yes
AaronAndyson
  • AaronAndyson
so 0.096 is the voltage drop?
Abhisar
  • Abhisar
\(\huge \checkmark\) Voltage drop across the cell

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