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Prepare thoroughly for the CBSE Class 10 Board Exams with this guide on CBSE Class 10 Science Chapter 11 Important Questions - Electricity. It covers key topics like Ohm’s law, resistance, electric power, and circuits, ensuring you have a solid understanding to excel in your exams.
Here are 50 important questions on Cbse Class 10 Science Chapter 11 Important Questions - Electricity
These questions cover fundamental concepts, calculations, applications, and safety measures related to electricity as outlined in the document provided.
Also Refer:
Best Reference book for Class 10 Subject wise
This chapter explores the fundamentals of electric current, the relationship between voltage, current, and resistance, and their applications in daily life. Key concepts include Ohm’s Law, resistance, the heating effect of current, and electric power.
Electric Current (I):
• Flow of electric charge through a conductor.
• Formula:
I = \frac{Q}{t}
Where:
• I: Current (in amperes), Q: Charge (in coulombs), t: Time (in seconds).
Potential Difference (V):
• The difference in electric potential between two points in a circuit.
• Formula:
V = \frac{W}{Q}
Where:
• V: Potential difference (in volts), W: Work done (in joules), Q: Charge (in coulombs).
Relationship Between V and I (Ohm’s Law):
• Ohm’s Law: The current flowing through a conductor is directly proportional to the potential difference across it, provided the temperature remains constant.
V = IR
Where:
• R: Resistance (in ohms, \Omega).
Resistance (R):
• Opposition to the flow of electric current in a conductor.
• Formula:
R = \frac{\rho \cdot l}{A}
Where:
• \rho: Resistivity (in ohm-meter, \Omega\cdot m), l: Length of the conductor, A: Cross-sectional area.
Resistivity (\rho):
• Property of a material affecting its resistance.
• Depends on: Material and temperature (not dimensions).
1. Length of the Conductor (l): Resistance is directly proportional to length (R \propto l).
2. Area of Cross-section (A): Resistance is inversely proportional to the area (R \propto \frac{1}{A}).
3. Material of the Conductor: Different materials have different resistivities.
4. Temperature: Resistance increases with temperature for metals.
Series Combination:
• Resistors are connected end-to-end.
• Total Resistance (R_s):
R_s = R_1 + R_2 + R_3 + \dots
• Current (I): Same through all resistors.
• Voltage (V): Divided across resistors.
Parallel Combination:
• Resistors are connected across the same two points.
• Total Resistance (R_p):
\frac{1}{R_p} = \frac{1}{R_1} + \frac{1}{R_2} + \frac{1}{R_3} + \dots
• Current (I): Divided among resistors.
• Voltage (V): Same across all resistors.
Applications in Daily Life:
• Series: Used in decorative lights to reduce voltage.
• Parallel: Used in household wiring to allow independent operation of appliances.
• Definition: When electric current flows through a conductor, some energy is converted to heat due to resistance.
• Formula (Joule’s Law of Heating):
H = I^2 R t
Where:
• H: Heat produced (in joules), I: Current, R: Resistance, t: Time.
Applications in Daily Life:
1. Electric Heaters and Irons: Convert electrical energy into heat.
2. Fuse Wires: Designed to melt and break the circuit when excess current flows.
• Definition: The rate at which electric energy is consumed or produced.
• Formulae:
P = VI, \, P = I^2 R, \, P = \frac{V^2}{R}
Where:
• P: Power (in watts, W), V: Voltage, I: Current, R: Resistance.
• Unit: Watt (W); 1 watt = 1 joule/second.
Commercial Unit of Energy:
• Kilowatt-hour (kWh): Energy consumed when a device of 1 kW runs for 1 hour.
1 \, \text{kWh} = 1000 \, \text{W} \times 3600 \, \text{s} = 3.6 \times 10^6 \, \text{J}
The chapter Electricity focuses on key concepts like Ohm’s law, electric current, and circuits. Understanding these principles is essential for performing well in the CBSE Class 10 Board Exams.
By studying CBSE Class 10 Science Chapter 11 Important Questions - Electricity and practicing sample papers, students can enhance their understanding.
Consistent revision and clear notes will ensure excellent exam preparation.
Chapter 1 Chemical Reactions And Equations
Chapter 2 Acids, Bases, And Salts
Chapter 3 Metals And Non-Metals
Chapter 4 Carbon and its compounds
Chapter 6 Control And Coordination
Chapter 7 How Do Organisms Reproduce?
Chapter 8 Heredity And Evolution
Chapter 9 Light – Reflection And Refraction
Chapter 10 The Human Eye And The Colourful World
Chapter 12 Magnetic Effects Of Electric Current
Also Refer:
Class 10 Science NCERT Book PDF
Class 10 Science Sample Papers
Below are some of the frequently asked question on the topic Electricity class 10 science:
