How to calculate ammeter and voltmeter readings? | Socratic
2018年2月26日 · Circuit a: Voltmeter reads 1.5V, Ammeter reads 7.5A Circuit b: Voltmeter reads 7.5V, Ammeter read 1.5A Circuit a: Both batteries are in series so total valtage is 15V Circuit sries restnace is 2 ohms So Current I= V/R = 15/2 =7.5A Voltage drop across top 1 ohm resistors = I*R=7.5V, right side being +ve So Voltmeter reads +7.5 -6 V ==+1.5V Circuit b: The 9V and 6 V sources oppose, so resultant ...
What is the reading of the voltmeter when switch is off and on?
2018年2月24日 · a. 6 V b. 4V When the switch is off,current will not be flowing through the distal 100 Omega resistor, So,current flowing through the circuit is 12/(100+100) = 0.06 A So,reading of voltmeter will be equals to the potential drop across it, i.e I*R=0.06*100=6 V When the switch is on,the distal 100 Omega resistor is in parallel with with the resistance of …
What is the correct way of connecting an ammeter and a voltmeter?
2018年6月8日 · An ammeter is connected in series while a voltmeter is connected in parallel. • An ideal ammeter has almost negligible resistance. As a result, it must be connected in series so that as much current can pass through it as possible. If it is connected in parallel, the circuit will be shorted and no current will pass through any electrical components connected in the circuit. • …
Why should an ideal voltmeter have infinite resistance, and
2017年10月10日 · This is so that the meter interferes with the circuit being tested as little as possible. When we use a voltmeter, we are creating a parallel path across a device, which draws a small amount of current away from the device being tested. This impact on the voltage across that device (because V=IR, and we are reducing I). To minimize this effect, the meter should draw as little current as ...
Which has greater resistance Voltmeter or millivoltmeter?
2017年12月29日 · Voltmeter Let us first understand how a voltmeter or mill-voltmeter is connected in circuit In order measure a device's voltage, meter must be connected in parallel to that device . This is important because meters connected in parallel experience the same potential difference. We also know that voltmeter or mill-voltmeter should have very high resistance so that it should not change the ...
How do you calculate the internal resistance of a battery?
2015年1月24日 · A real-life battery can be described as an ideal voltage source with an internal resistance. If you measure the voltage of a battery with a Volt-meter, which has a very high resistance, you'll get the raw voltage. If you add a smaller resistance between the poles of the battery, you will see that Ohm's law is not followed, but the amperage is lower than expected. An example Raw voltage: 9V (no ...
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How can i calculate voltage drop in a parallel circuit?
2018年3月3日 · Well for that you need a circuit to show me,still I am giving you two examples with how to work out. See the circuit below, It is clear that, 2 Omega is in parallel with the other 2 Omega,and their resultant is in series with the 1 Ohm and the 3 Ohm,so net resistance of the circuit is (2*2)/(2+2) +1+3 = 5 Ohm So,current flowing through the circuit is 20/5=4 A so,potential drop across each ...
A cell has an e.m.f of 1.08 v and an internal resistor of 0. ... - Socratic
2018年8月13日 · 4 Omega The circuit diagram in the given case appears as follows, Here, you can place the internal resistance as a separate resistor in the circuit and in that case potential drop across the cell will be V_A - V_B Now, it is given that the potential drop across the cell is 0.96V; that means this drop is due to some potential drop across the 0.5 Omega internal resistance in the cell, we can say ...
What is past tense of "read"? Is it "reed"? - Socratic
2016年6月27日 · The past tense of the verb "to read" is "read". The verb "to read" is an irregular verb. While both the present tense and the past tense of "to read" are spelled exactly the same way, they are pronounced differently (words such as these are known as homographs). In the present tense the verb "to read" is pronounced like "reed" (the aquatic plant), while the past tense is pronounced like the ...