A detailed overview of resistors.

1. RESISTORS
By Shreyansh

2. WHAT IS A RESISTOR?
• A resistor is a passive electrical component with the
primary function to limit the flow of electric current.
• Resistors are used to reduce current flow, adjust
signal levels.
• Resistance is measured in ohms.
• Symbol

4. THE FORMULA
• An ohm is the resistance that occurs when a current of
one ampere passes through a resistor with a one volt
drop across its terminals.
• The current is proportional to the voltage across the
terminal ends.
• This ratio is represented by Ohm’s law.
• V=IR

5. HOW TO KNOW THE RESISTANCE?

6. USE OF A RESISTOR

7. TYPES OF RESISTOR
There are two types of resistors:
1. Fixed resistors
2. Variable Resistor

8. • Fixed resistor
1. Carbon composite resistor
2. Film resistor
3. Wire wound resistor
4. Resistance wire
• Variable resistor
1. Rheostat
2. Potentiometer
3. Thermister
4. Humistor
5. Varistor
6. Photo resistor

9. CARBON COMPOSITE RESISTOR

10. FILM RESISTORS

11. WIRE WOUND RESISTOR

12. RHEOSTAT

13. POTENTIOMETER

14. THERMISTER

15. HUMISTOR

16. VARISTOR

17. PHOTORESISTOR

18. READING COLOUR CODES ON THE RESISTOR

19. CALCULATING RESISTANCE

20. SERIES CONNECTION

21. PARALLEL CONNECTIONS

22. THANK YOU