SPM:Analysing Series & Parallel Circuit

Sorry for not updating frequently last week ..i’ve been focusing on my tuition class..
one thing I can concluded, most of the student can now feel the SPM pressure
Hmm...cuti dah abis...so lets get back to business…

As promised, I’ll b discussing on analysing series & parallel circuit.
Hopefully u'v watched the previous video

2.3 Analysing Series & Parallel Circuit

In this subtopic u need to identify the differences between series & parallel circuit.

The differences are in terms of

i. amount of current passing through in each resistor
ii. voltage across each resistor
iii. and its total resistance

Ok, lets analyse series circuit..

In series circuit, current flows are equal through out the circuit.
I = I1 = I2

But, for voltage,

V=V1 + V2…

and for the total resistance in the bulb equals to,

R= R1 +R2 +R3

in series circuit… if one of the bulb blown up, the other bulb will
not light up.

Lets now examine parallel circuit..
What are the differences in Parallel Circuit compared to series circuit??

1. The arrangement looks different,usually parallel circuit has branches.

2. The amount of current passing through each bulb(resistor) are not equal
if each bulb has different resistance.

3. In terms of calculation,
The amount of current in the circuit can be represented by,
I= I1 + I2

The voltage across the bulb/resistor are equals to the voltage of the battery
V= V1 = V2

and the total resitance of the bulb can be calculated as,
1/R = 1/R1 + 1/R2

4. However, if one of the bulb has blown up, the others are still working

I'll discuss on passed SPM question on next post