P
Phibir
Hi,
I've signed up to these forums hoping to get a little help with a basic understanding of electronics.
I have two daughters age 9 who were bored last weekend, so I went to my local electrical shop and purchased a random basic beginners Electrical kit as the shop keeper thought suitable. I have no understanding of electronics and have been searching the net to hopefully get a better understanding.
We have a 9V battery an LED and some Resistors. I have read about Ohm's Law and understand that if I do the equation 9÷0.03=300Ω (9 = 9 Volt Battery, 0.03 = 30mA LED). This presumably means that I need a 300Ω or there about rated resistor?
YouTube videos show that the formula could be changed depending on what's needed, for example..
R=V/I
V=R/I
I=R/V
So if I was to find an already built circuit but with no battery attached. I should be able to look at the parts I have in front of me to calculate the battery that I need, for example..
0.03÷300 = 0.0001 (0.03 = 30mA LED, 300 = 300Ω Resistor). I have no idea what relevance 0.0001 is in Volts.
If anyone has time and can be a*sed to help me out, then I would be very grateful.
Thank you!
Phbir
I've signed up to these forums hoping to get a little help with a basic understanding of electronics.
I have two daughters age 9 who were bored last weekend, so I went to my local electrical shop and purchased a random basic beginners Electrical kit as the shop keeper thought suitable. I have no understanding of electronics and have been searching the net to hopefully get a better understanding.
We have a 9V battery an LED and some Resistors. I have read about Ohm's Law and understand that if I do the equation 9÷0.03=300Ω (9 = 9 Volt Battery, 0.03 = 30mA LED). This presumably means that I need a 300Ω or there about rated resistor?
YouTube videos show that the formula could be changed depending on what's needed, for example..
R=V/I
V=R/I
I=R/V
So if I was to find an already built circuit but with no battery attached. I should be able to look at the parts I have in front of me to calculate the battery that I need, for example..
0.03÷300 = 0.0001 (0.03 = 30mA LED, 300 = 300Ω Resistor). I have no idea what relevance 0.0001 is in Volts.
If anyone has time and can be a*sed to help me out, then I would be very grateful.
Thank you!
Phbir