Ask Singapore Homework?
Upload a photo of a Singapore homework and someone will email you the solution for free.
Question
secondary 2 | Maths
One Answer Below
Anyone can contribute an answer, even non-tutors.
This is a science topic, please help with the questions that are blank urgent thanks!!
Date Posted: 5 years ago
Views: 297
(a)
1/R = 1/3 + 1/6
R = 2 ohms
effective resistance is 2 ohms
(b)
total resistance = 2 + 6 = 8 ohms
(c)
p.d. across PQ
= 2/(2+6) x 24
= 6 V
(d)
p.d. across QR
= 6/(2+6) x 24
= 18 V
OR
p.d. across QR
= 24 - 6
= 18 V
(e)
current flowing thru' A
= 6/3
= 2 A
...
1/R = 1/3 + 1/6
R = 2 ohms
effective resistance is 2 ohms
(b)
total resistance = 2 + 6 = 8 ohms
(c)
p.d. across PQ
= 2/(2+6) x 24
= 6 V
(d)
p.d. across QR
= 6/(2+6) x 24
= 18 V
OR
p.d. across QR
= 24 - 6
= 18 V
(e)
current flowing thru' A
= 6/3
= 2 A
...
See 1 Answer
done
{{ upvoteCount }} Upvotes
clear
{{ downvoteCount * -1 }} Downvotes
in part a), the law stating that the effective resistance across 2 parallel resistors A and B) is as follows: Reffective = 1/[1/Ra+1/Rb]
after part a), we combine the resistors A and B into one effective circuit as seen to find the total resistance simply by adding to solve part b).
In part C, we use Ohm's Law (V=IR) to find the total current in the circuit which is also equal to total current in C.
In part D, we use potential dividers where the voltage across 2 points PQ = [(Rpq)/(Rtotal)]*Vtotal
The same principle can be applied in part e, or the answer can also be obtained by subtracting Vpq from the total voltage, or emf of battery.
in part f, the current in A is found by the formula ([1/Ra)/(1/Ra+1/Rb)]*(Total Current in branch)
after part a), we combine the resistors A and B into one effective circuit as seen to find the total resistance simply by adding to solve part b).
In part C, we use Ohm's Law (V=IR) to find the total current in the circuit which is also equal to total current in C.
In part D, we use potential dividers where the voltage across 2 points PQ = [(Rpq)/(Rtotal)]*Vtotal
The same principle can be applied in part e, or the answer can also be obtained by subtracting Vpq from the total voltage, or emf of battery.
in part f, the current in A is found by the formula ([1/Ra)/(1/Ra+1/Rb)]*(Total Current in branch)
Date Posted:
5 years ago
360 Tutoring Program