Like what you saw?
Create FREE Account and:
- Watch all FREE content in 21 subjects(388 videos for 23 hours)
- FREE advice on how to get better grades at school from an expert
- FREE study tips and eBooks on various topics
PhD., University of Maryland
Jonathan is a published author and recently completed a book on physics and applied mathematics.
Resistance is the relationship between potential difference and electric current generated. High resistance needs a large potential difference to generate an appreciable current. Electrons will generally flow through the path with the least resistance.
So let's talk about resistance. What is resistance? Resistance gives us the relationship between the potential difference that we apply and how much current we generate from that potential difference. So if I've got a high resistance, that means I need a very large potential difference to generate even a small amount of current. If I've got a small resistance, then that means even a tiny potential difference will generate an appreciable current. So the symbol for resistance is r, r for resistance and the unit is ohm. Alright.
So what is an ohm? One ohm and we use this strange horse shoe symbol for ohm, one ohm is equal to one volt per amp. And it's real easy to understand what resistance means just from this relationship.
If I've got a 5 ohm resistance, then it means I need 5 volts of potential difference to generate one amp of current. Alright. So, there's a nice analogy that I really like with resistance and resistors and that has to do with traffic flow. So I always like to think about resistance as like traffic lights. The more resistance you've got, the more traffic you've got, the less people would choose to take that road. If there's an alternate road that has less traffic lights, then more people will take that road than the one that's got all the traffic lights.
Alright. That's resistance.
Please enter your name.
Are you sure you want to delete this comment?
- Conservation of Charge - Electric Charge 31,180 views
- Charge Transfer - Electroscope 20,990 views
- Electric Force - Coulomb's Law 24,515 views
- Electric Fields 22,380 views
- Electric Potential 22,724 views
- Electrons - Quantization of Electric Charge 17,380 views
- Conductors 11,678 views
- Insulators 9,468 views
- Electric Current 20,514 views
- Potential Difference 20,312 views
- Ohm's Law 16,858 views
- Electric Circuits 15,733 views
- Resistors in Series 13,353 views
- Resistors in Parallel 14,757 views
- Resistor Circuits 12,784 views
- Power 8,050 views
- Capacitors 15,284 views
- Capacitors in Series 11,939 views
- Capacitors in Parallel 10,444 views
- Capacitor Circuits 11,757 views
- RC Circuits 19,699 views