1. Applied Electricity 2
Electrical Resistance

2. Applied Electricity 2
Symbol for electrical resistance is R
SI unit for electrical resistance: Ohm
Reciprocal quantity is electrical conductance,
measured in siemens.

3. Applied Electricity 2

4. Applied Electricity 2

5. Applied Electricity 2

6. Applied Electricity 2
ρl
R=
A

7. Applied Electricity 2
ρl
R=
A
ρ is the electrical resistivity of the
material

8. Applied Electricity 2
ρl
R=
A
l is the length of the wires in meters.

9. Applied Electricity 2
ρl
R=
A
A is the cross-sectional area of the
material in m2

10. Applied Electricity 2
V=IR

11. Applied Electricity 2
V=IR
Transposed to: R= V/I

12. Applied Electricity 2
Resistivity: length and cross-sectional area