An ideal voltmeter V is connected to a 2.0-Ωresistor and a battery with emf 5.0 V and internal r

An ideal voltmeter V is connected to a 2.0-Ωresistor and a...

Key Concepts

Ideal Voltmeters

An ideal voltmeter is designed to measure the voltage across two points in a circuit without drawing any current, meaning it has infinite resistance. This property ensures that the voltmeter does not affect or load the circuit it is measuring, allowing for an accurate determination of voltage values.

Terminal Voltage

The terminal voltage of a battery is the voltage available at its output terminals, which is the emf minus the voltage drop across the internal resistance when current flows. Understanding terminal voltage is important for predicting the actual voltage delivered to external circuit components under load.

Internal Resistance

Internal resistance is an inherent property of real batteries that causes a voltage drop within the power source when current is drawn. This phenomenon explains why the terminal voltage of a battery under load is lower than its ideal electromotive force (emf), impacting the performance and efficiency of the circuit.

Series Circuit Analysis

In series circuits, the total resistance is the sum of individual resistances, and the same current flows through each element. Analyzing series circuits helps determine how voltage divides among various components, which is crucial when connecting elements such as resistors and batteries in a circuit.

Ohm's Law

Ohm's Law is a fundamental principle in electrical circuits that establishes the linear relationship between voltage (V), current (I), and resistance (R) in the form V = IR. This law is essential for calculating how current flows through circuit elements given a specific voltage drop and resistance, forming the basis for analyzing both simple and complex circuits.

Transcript

00:01 Hi friends.

00:02 So we have ah, simple electrical circuit that has a resistance off too.

00:12 This resistance is connected.

00:16 Two of wood creature in cities one that okay, in cities and this port, where is ideal? so an idol volt meter is connected in siri's with her, chris is tense and who is all are connected toe are constant world its source like a battery.

00:40 How five votes.

00:44 The battery also has who internal assistance, which is equal to zero point five.

00:56 So the current is expected to floor from this positive terminal and end up to this *** terminal even that the circuit is closed.

01:07 Right? so what we have for solving this problem is that external resistance i didn't display capital r is it called too? the internal resistance.

01:18 I didn't order this vice monarch that is equal to zero point 51 the imf off the battery.

01:25 He is equal to five balls.

01:31 So what we have to find out is what is the current in the 21 resister? so what is current? i i is equal to what the other question asks us about.

01:49 The terminal board is off the battery and the reading under force meter.

01:54 So let us first i find this current.

01:57 So you know the expression for current, right? the current his was not a the current is given by total vote is hear that little brothers.

02:09 I do know this my team divided by the total resistance.

02:16 So portela resistance twitter resistance in the circuit.

02:29 So the total of what is that is supplying the current is five.

02:34 So i did five years and who are waiting for that current? the indentations on the bad yourself.

02:41 So one is five with but to some extent of this sister, can you see other sisters? you may not have seen this, but i can see that this look att this world, richard this whatever it is i do, right? so unidentified meter has an infinite resistance.

03:08 Using the bold meter has have very high resistance and they are connected in pattern panel.

03:15 But this port marie's idea at most resistance in this form committees in finite.

03:21 So just i write you find that here.

03:24 So what will this exclusive give us as a whole? 0.5 plus two plus in fifties for five open infinity that newsroom there.

03:35 So the total current in the circuit is they were done with a also again, seeing this in another way.

03:43 If you explain this problem, theoretically.

03:46 So since this world meter is an ideal one, this has infinite resistance.

03:50 So we can just consider that the recent incident in finance.

03:56 So the wire is working here broken, so has infinite resistance.

04:01 So you can consider that of what meter is connected.

04:07 That misses the potential difference across these two points.

04:12 But these two points are not connected.

04:16 That is, there is a final resistance between mr now you look at the battery home.

04:22 What's with this? patrick? how much current with this battery giveaway? so this circuit is know what? open.

04:29 So so when do you think that an open circuit has current in it? no.

04:34 So it is no crime...

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