Electrical energy and power

Question 1 Define the term electrical energy? Question 2 Define the term electric  power? Question 3 What is the SI unit of power? Question 4 What is the commercial unit of KWh? Electrical energy The work done by a source of electricity to maintain a current in an electrical circuit is called as electrical energy….

Resistance are connected in series

Question 1 What is meant by series combination of resistors? Question 2 You are provided with three resistors R1 , R2  and R3 . Write the formula for the equivalent resistance R when there resistors are connected in series? Question 3 A resistance of 6 Ω is connected in series with another resistor of 4 Ω.A potential difference of…

Circuit Diagram

Question 1 What is a circuit diagram? Question 2 Write the symbol for voltmeter and ammeter? Circuit Diagram A diagram showing the arrangement of various components in an electric circuit with the help of their symbols is called circuit diagram.  

Heating Effect of electric current

Question 1 How heat is produced  when electric current is passed through a conductor? Question 2 Define Joule’s law? Question 3 How does electric heater,iron and water heater work on heating effect of current? Question 4 Why does filament of an electric bulb is made up of tungsten? Question 5 Why electric fuse in the…

Resistors are connected in parallel

Question 1 What is meant by parallel combination of resistors? Question 2 You are provided with three resistors R1 , R2  and R3 . Write the formula for the equivalent resistance R when there resistors are connected in parallel? Question 3  Why parallel arrangement of resistors is used in domestic electric circuit? Question 4 A wire of…

Resistance

Question 1 A piece of wire is redrawn  by pulling it until its length is doubles.Compare the new resistance with the original value? Question 2 How is the resistivity of a material related to the use of that material? Question 3 On what factors does the resistance of a conductor depends? Question 4 Why connecting…

Ohm’s Law

Question 1 State ohm’s law? Question 2 What is the resistance of an electric arc lamp,if the lamp uses 20 A when connected to a 220 Volt line? Question 3 Define resistance of a conductor.What is its SI unit? Question 4 Write the formula which relates electric current,time and electric current? Question 5 What kind…

Electric potential and potential difference

Question 1 How much work is done in moving a charge of 2 Coulombs,from a point at 118 Volts to a point at 128 Volts? Question 2 Name the device used for measuring potential difference? Question 3 What are the conditions under which charges can move in a conductor? Question 4 How will you maintain…

Electricity

Question 1 Define the term electric current? Question 2 What is the SI unit of electric current? Question 3 Define the term ampere? Question 4 What is an open electric circuit? Question 5 What is a closed electric circuit? Electricity The flow of water in rivers and canals is called water current. The flow of…