Resistor or Capacitor Please Help!! - Page 1
Forum section: electronics / beginners

author: giovesjo
author_rank: Newbie
timestamp: May 23, 2019, 07:35:35 pm
content: Hi everyone...I have a very good question that for the most of you will sound stupid maybe....Is this little boy in the photo a Resistor or a Capacitor?thanks in advance

author: mariush
author_rank: Super Contributor
timestamp: May 23, 2019, 07:56:28 pm
content: It could be an inductor.If not, most likely it's a capacitor.Why not use a multimeter to check resistance across the pads?

author: giovesjo
author_rank: Newbie
timestamp: May 23, 2019, 08:08:25 pm
content: I checked and it gave me 0.2 ohms but this is also the value of the Multimeter if I connect the leads togheter.thanks for your answer!!

author: helius
author_rank: Super Contributor
timestamp: May 23, 2019, 08:10:59 pm
content: In that case, it is likely an inductor (the gray color also indicates that, as inductors are made from ferrites or iron alloys).Some resistors are made to be 0 ohms, effectively a short jumper, but SMD resistors are most often colored black.

author: giovesjo
author_rank: Newbie
timestamp: May 23, 2019, 08:12:37 pm
content: So you will exclude that is a resistor?

author: Zero999
author_rank: Super Contributor
timestamp: May 23, 2019, 09:40:35 pm
content: Quote from: giovesjo on May 23, 2019, 08:12:37 pmNot entirely. It could be a 0.2Ohm resistor, but it's unlikely.

author: Psi
author_rank: Super Contributor
timestamp: May 23, 2019, 10:06:29 pm
content: Usually you can tell resistor apart because their height is quite a bit less than their width.With capacitors/inductors their height is closer to their width.The material also looks different. Capacitors 'look' a bit waxy while resistors look a bit like painted cardboard.Inductors vs capacitors is a little more tricky, often inductors are black/dark colours but not always.Capacitors are often a brown/beige colour.

author: radiolistener
author_rank: Super Contributor
timestamp: May 23, 2019, 10:51:34 pm
content: Looks like ferrite bead (inductor with high loss, designed in order to filter power voltage from high frequency noise). It should be near zero Ohm at DC and about 200-600 Ohm at 100 MHz AC.For example:https://www.murata.com/en-global/api/pdfdownloadapi?cate=&partno=BLM02BC220SN1%23

author: wraper
author_rank: Unknown
timestamp: May 23, 2019, 11:13:36 pm
content: No chance being resistor. If color as looks on the picture is correct, should be ferrite bead or varistor. Also could be inductor but not very likely being located like this.

author: wraper
author_rank: Unknown
timestamp: May 23, 2019, 11:14:40 pm
content: Quote from: Zero999 on May 23, 2019, 09:40:35 pmOnly if you use ferrite beads as resistors.

author: Zero999
author_rank: Super Contributor
timestamp: May 24, 2019, 07:32:31 am
content: Quote from: wraper on May 23, 2019, 11:14:40 pmIt could be used as a resistor, but it won't be a very good one. Yes, you're right. It's a ferrite bead of course!

author: giovesjo
author_rank: Newbie
timestamp: May 24, 2019, 07:36:49 am
content: thanks for your answer very clear.

author: giovesjo
author_rank: Newbie
timestamp: May 24, 2019, 07:41:58 am
content: I think you nailed it...thanks man!!

author: Arjunan M R
author_rank: Regular Contributor
timestamp: May 25, 2019, 03:09:14 pm
content: Quote from: Zero999 on May 23, 2019, 09:40:35 pmIf it is a 200mΩ resistor it will be a current shunt(not sure(thats the only purpose for 200mΩ as i know)).I dont think current shunts will be made that small(lower power rating).I think it will be an inductor.

author: wraper
author_rank: Unknown
timestamp: May 25, 2019, 04:22:49 pm
content: Quote from: Arjunan M R on May 25, 2019, 03:09:14 pmIt's not a resistor/current shunt but there is no issue of small resistor being current shunt. For example 0.2 ohm 0402 resistor can pass up to 0.5A current.