Embibe Experts Solutions for Chapter: Electricity, Exercise 1: Karnataka Board-2020

Draw the diagram of an electric circuit in which the resistors $R_1, R_2$ and $R_3$ are connected in parallel including an ammeter and a voltmeter and mark the direction of the current.

According to Joule’s law of heating, mention the factors on which heat produced in a resistor depends. According to this law write the formula used to calculate the heat produced.

An electric refrigerator rated $400 \mathrm{W}$ is used for $8$ hours a day. An electric iron box rated $750 \mathrm{W}$ is used for $2$ hours a day. Calculate the cost of using these appliances for $30$ days, if the cost of $1 \mathrm{kWh}$ is $\mathrm{Rs}.3/-$.

How does overload and short-circuit occur in an electric circuit ? Explain. What is the function of fuse during this situation?

Observe the given circuit diagram.

Calculate the total resistance and the total current flowing through the circuit.

What is the meaning of the statement “The potential difference between two points is $1 \mathrm{V}$” ? Name the device used to measure potential difference. What is resistance of a conductor? What is electric power? Write three formulae used to find electric power.

Observe the following figure. Which property of diode is indicated here? Explain that property.

The resistance of a conductor is $27 \mathrm{\Omega }$. If it is cut into three equal parts and connected in parallel, then its total resistance is