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

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, fiel.

00:01 Sir.

00:01 Here is a small circuit electric circuit is very simple.

00:07 It has a to him resistance that is connected in series with a whole meter v and a constant source of five.

00:19 Gold is applied across this circuit and the battery has and internal resistance heart, which is equals, which is called a zero point five and extend resistance.

00:41 Captain are i do not do this by captain larkin and interest seances two.

00:51 What water to find out is a current flowing across this sister.

00:58 Hi.

01:01 The terminal parties across the colonel borders off the battery.

01:08 He's going to what? and the reading in peter, that is a good one.

01:14 So little straight.

01:15 The given perimeters have kept our is equal to two internal resistance because to your point five and the imf off the back of that who have used his hole.

01:38 So to find out the current first, i close to what? so the current driven by this battery depends upon the resistance off the circuit.

01:54 And the fort is off the battery, right? that is ari's called the icicle too.

02:01 Levi are that is porter's upon resistance, actually icicle too.

02:06 He is by total portis off under assistants are so in this case, the foot.

02:14 The battery has a what in shell off two, given the current off five fold.

02:21 So how much resistance that's it having the circuit.

02:24 So it had the resistance off 0.51 as its internal resistance less what it is to hum external resistance.

02:39 And you might not have noticed there is one more resistance here.

02:43 See, this port meter also has a resistance, and a meter has very high resistance.

02:49 So that was that's my board vigorous candidate in parallel to each other.

02:52 But this because the circuit has more committing sin is and also the questions says that the media is ideal.

03:00 So if a perimeter is ideal, then it has in finance resistance.

03:05 So just i use in finance here, so something.

03:10 So if you are infinite with anything that makes it infinity, if something often infinite is what it is, something upon your treaties zero.

03:18 So there is no current across the circuit.

03:21 You can also think this another way, like this one has been fired.

03:27 Resistance.

03:28 So it is just like the connection is broken at this point, so we can just erase this point.

03:36 Consider that there is no way there is no connection there.

03:39 Support meter.

03:40 But there is no connection between the circuit because the resistance is infinity.

03:44 The current camera throw a cross.

03:47 Infinity! so? so there is off work meter that misses the potential across these two points.

03:56 But these two points are not connected.

04:00 The resistance in between them is infinity.

04:02 Why? why? because this world which is an ideal one that has been kind of resistance...

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