Robotics and Electronics Tutorial - 13 - Measuring Current

[Anothertransientform]

Do resistors effect current as well as volts, or just volts?

[youthofthenation112]

you are the best :) thank you

[salimkhan007]

I =Q/T

[Shocker9]

It's pronounced mult-e-meter, not mult-i-meter!

[purehawaiianboi23]

@Shocker9 he said in his multimeter video how to say it. He also decided/stated that he was going to call it a multimeter. Just like the two way to say potato.

[Shocker9]

@purehawaiianboi23 In the many years i've been around electronics, i've never heard anyone on either side of the pond pronounce it like him. The spelling is multimeter but is pronounced mult-e-meter. It's as simple as that.

[purehawaiianboi23]

@Shocker9 It doesn't matter because he ended the series lol

But i was just stating that he said it the right way in the multimeter intro then i guess because of the way it's spelled he felt it necessary to pronounce it in that manner. I do get what you mean though.

[RodCastler]

Great explanation but buddy you violated rule number one: Do not rotate the dial while the meter is connected to a circuit. You first turn, then make sure probes are connected in the right place and only then, you connect your meter to a circuit.

[reidy105]

I'm very new to electronics. This is a simple and easy to understand guild, I hope you go into teaching, That way the Future would be in very safe hands. thank you

[Maloperverso]

You have a gift for explaining things my friend, I took electrical engineering 1 & 2 in college and electrical engineering lab and I never understood circuits and electricity as well as I do after watching your videos.

[killer2611]

@Maloperverso lol how the hell did you pass then? im doing the same thing in highschool.

[tajiknomi]

When we connect resisters in series...then we say that same Amount of current flow through the Circuit......

Suppose we have 2 resisters connected in series in a circuit...when current start to flow(suppose from -ve terminal) and goes through first resister,now some energy must be used by first resister...now how can the same energy be transmitted to the 2nd one!!???

how is the current constant>??as some energy is used by the 1st one..!!

If any 1 knows about it...Reply me.

[redowblack]

@tajiknomi Think of electric flow in a circuit as hot water flowing in a hose. Water would be the current and the heat of the water would be the voltage. As water runs through the hose it loses heat to the environment, but it keeps the same amount of water in all parts of the circuit (or hose). Roughly, current = coulomb (electrons) per second. And voltage = joules (energy) per coulomb.

[tajiknomi]

@redowblack

Thanks , Now i Understand that Concept :)

[Xiaodhanan]

ohms law .

[tajiknomi]

I HAVE ONE MORE question..

when i connect my multimeter to in series wid a circuit.....its current gradually decreases....!!and no device is operating in a circuit.....!!!

[tajiknomi]

Can som1 tell me that the resistance in a circuit is essential for measuring current through the Multimeter?????????????

[emactan]

There must be enough resistance in the circuit such that the current will not exceed the current limit of the range you've selected. For example if you set your meter to its 1000mA range then the current going through your meter must be 1000mA or less, or your risk blowing the meter's fuse and perhaps ruining your meter.

[Armoredlamb]

Thanks a lot man

[paintingglass]

as much i saw circuits of amplifiers and instrument circuits its always from the negative to positive , from cathode to anode , and here in robotics and electronics you showing the opposite of that , how come? and thanx for the ur videos

[Vicky867]

I don't know if this answers your question, but I think you are confusing electron flow (negative to positive) with current flow (from positive to negative)

[minimax020]

WHat Would happen if you placed the multimeter infront of the resistor?? would the value be bigger??

[SvenBoulanger]

It won't. The current in a circuit in series is the same wherever you measure it.

[hutakesvi]

@SvenBoulanger uhhhh no its not

[SvenBoulanger]

@hutakesvi Kirchoffs Current Law (KCL) says that in any node in a circuit the sum of all currents has to be 0 (when a current flows out of the node that current is considered negative). The current can't 'split up' at any point, so the current will stay constant in the whole system, and is only time dependent (the resistor will warm up which will cause an increase in resistance and thus a decrease in current).

[emactan]

If the resistor is connected to the battery (thus, current is going the resistor) and you touch the multimeter probes across the resistor and the multimeter is set to measure current (mA) your meter's fuse will blow and if it's a low quality meter, the meter itself may be damaged. You only connect the probes across the resistor when measuring voltage

[daxweb]

where is the robot?

[tubeyouabc1]

To measure current you must first open circuit then connect meter leads to both open wires. In other words the meter is connected in series with the load or simple the circuit to measure ampere.

[pimpedout1620]

GREAT JOB BUCKY

Keep it up !

Very Useful tutorials

[hjsca]

Great stuff, keep it up :)

[jancom777]

The "M" stands for "milli"... Llike MILLImetre, MILLIlitre, etc. If you use the Metric system rather than the Imperial, you'd know^^

[i2aver]

Although I dying to make this robot and waiting forever now, these tutorials are well worth it. It's better then learning this at a community college. Keep up the pace.

[AtheistsBane]

srsly.... this would be much more enjoyable if you would put all this these videos into two or three.

[xsirhc6x]

start the bot! ahah

[atomdragon4]

yeah...*SIGH*

[elkslider18]

hells yeah

[anthonyjr100]

Awesome Tutorials :D

[ChocolateCaramels]

interesting

[fabiandthomas]

great

[underburn0]

very nice...5 stars again

[kandelbiz]

i lobe ur tutorials.