Solved assignments and essays for HNC/HND Electrical and Electronics Engineering

University
HNC/HND ELECTRICAL AND ELECTRONICS ENGINEERING
By
Your Name
Date
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© <Your Name> 2018

ANSWERS TO QUESTIONS
QUESTION 1
Part A
Problem statement
Given the formula:
f = uv
u+v
We are required to transpose it and change its subject to v.
Solution
Step1
Multiply the right hand side and the left hand side with the denominator on the right hand side to
eliminate the denominator (Watts, 2012).
f (u+ v)= uv
u+ v (u +v )
f (u+ v)=uv
Step2
Open the brackets of the above equation through expansion.
fu+ fv=uv
Step 3
Collect the like terms.
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fu=uv−fv
Step 4
On the right hand side of the equation, we factor out v out of the brackets.
fu=v (u−f )
Step 4
Divide both sides of the equation by u-f.
v= fu
u−f
Part B
Problem Statement
Solving of the equation:
( 3.4 )2 x+3=8.5
Solution
Step 1
Take the logarithms of both the left hand side and the second hand side and multiply the
superscript on the left hand side with the log of the value on the left (Chapra and Canale, 2015).
2 x+3 ( log3.4 ) =log 8.5
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Step 2
Divide both the logs as below:
2 x+3= log 8.5
log 3.4
2 x+3=1.7487
Step 3
Solve to find the value of x
2 x=1.7487−3
2 x=−1.2513
x=−0.6256
Part C
Problem Statement
To find the value of t in the equation below given θ=58, V =255, R=0.1 and L=0.5.
θ=V e
−Rt
L
Solution
Step 1
Make t the subject of the formula as below:
θ
V =e
−Rt
L
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© <Your Name> 2018