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Fundamentals of Electrical Circuit

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This document is a comprehensive resource for anyone looking to deepen their understanding of electric current and the electrical properties of materials in the context of fundamental electrical circuits. It contains a collection of questions and answers that cover a wide range of topics, including Ohm's law, Kirchhoff's laws, resistance, capacitance, inductance, and more. This document is an ideal study aid for students and professionals alike who are studying electrical engineering and want to build their knowledge of the fundamental concepts and principles that form the foundation of the field. Whether you are looking to gain a deeper understanding of electrical circuits, or simply want to brush up on your electrical engineering knowledge, this document is an invaluable resource that provides clear, concise, and accessible explanations of complex concepts.

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Uploaded on
February 13, 2023
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Written in
2022/2023
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Fundamentals of Electrical Circuits
(Problems)



Introductory Concept of Electrical Circuits

Electric Current
1. A hair dryer draws a current of 3A. If it is switched
on for 5 minutes,
a. How much charge, and
b. How many electrons have passed through it?

Given:
𝑄= ?
𝑡 = 5𝑚𝑖𝑛 × 60 = 300𝑠𝑒𝑐
𝐼 = 3𝐴

Solution:
a. 𝑄 = 𝐼 × 𝑡
𝑄 = 3𝐴 × 300𝑠𝑒𝑐
𝑄 = 900𝐶 ANS

−19
b. Charge of 1 electron = 1. 6 × 10 𝐶
900𝐶
No. of electrons = −19
1.6×10 𝐶
21
No. of electrons = 5. 625 × 10 ANS

, Electrical Properties of Materials

Resisitivity
1. A wire 12m long has a resistance of 1. 5Ω. What will
be the resistance of 16m of the same wire?

Given:
𝐿1 = 12𝑚
𝑅1 = 1. 5Ω
𝐿1 = 16𝑚
𝑅1 = ?

Solution:
𝑅1
𝑅1 = 𝐿1
𝐿2
1.5Ω
𝑅1 = 12𝑚
16𝑚
24Ω𝑚
𝑅1 = 12𝑚
𝑅1 = 2Ω ANS
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