Q5: Choose the correct answer (solve in details if needed). 1. A resistor in a circuit has a value of 550 n. It is desired to decrease its value to 330 2. The resistance to be connected with it in parallel will be of: a. 740 92. b. 825 12. c. 892 02. d. 540 2 2. Kirchhoff's laws are useful in determining: a. Current flowing in a circuit. b. Power in a circuit. d. All of them. c. EMFs and Voltage drops in a circuit. 3. The power consumed in a circuit element will be least when the phase difference between the current and voltage is: a. 180°. b. 90¹. d. 60°. 4. Which of these is not a required condition for a balanced system: a. IV-V-Val. b. l. +1+1=0. c. V+V+ V₁=0. 5. The average value of a sinusoidal alternating signal is: b. Equal to the maximum value. b. Half of the maximum value. c. 637 times the maximum value. d. None of them.

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KVL and KCL

KVL stands for Kirchhoff voltage law. KVL states that the total voltage drops around the loop in any closed electric circuit is equal to the sum of total voltage drop in the same closed loop.

Sign Convention

Science and technology incorporate some ideas and techniques of their own to understand a system skilfully and easily. These techniques are called conventions. For example: Sign conventions of mirrors are used to understand the phenomenon of reflection and refraction in an easier way.