An idealized ammeter is connected to a battery as shown in Fig. E25.28

. Find (a) the reading of the ammeter.

Video transcript

Hi everyone today, we are going to determine what the am Attar is reading with a circuit with ideal AM Attar's shown in this um picture below. So in this particular circuit we know that the ad meter is going to be acting like a short circuit to the 12th omer sister. So the A with the way that it is actually being drawn Ashley, a short circuit what The 12th Omer sister. So the circuit Then essentially will only have wonder sister, which is going to be the 16. circuit will then only half one r equals 16. just like, so okay, So the 16.8 mm is essentially the internal resistance of the cell itself and the current through the meter is going to be equal to the current to the 16.8 mm. So the way we want to calculate this is two by recalling home slaw. So recall that um, slaw is fee equals I multiplied by R. And what we want to see is what the am meter is reading. So what we want to know is what the value is. So I will equal to rearranging this three equals R. So we know that the V here is going to be 12 hold and the R. Is going to just be the 16.8 own because this 12 is short circuited with the meter so we can plug things in. So I will then equals to 12 fold over the R. Which is 16.8 oh This will then give us a current value of 0.714 amp, which is going to be the answer to our problem, which is going to be option B just like so this current value is going to be the reading value on the thermometer here. And if you guys still have any questions on this or problems with this particular topic, please check out our other videos because we have similar videos on similar topics. That will definitely help you guys on getting a better understanding on this. Thank you. That'll be all for this breakfast problem.