Question

The circuit diagram shows a wire of 5 ohm connected to a battery of 10 V, an ammeter, a voltmeter.. Find the reading of ammeter and voltmeter​

Answer 1

Answer:

We use ohm's law to solve this problem. Since the incoming current is 4A, we say I=4A. The voltmeter reads a voltage drop of 20V across the resistor. This means that if we apply ohm's law on the resistor, we can say that V=I*R. Therefore, 20=4*R. This gives us that value of R to be 5 ohms.

This was the theoretical ideal case. Now, with non ideal meters, in the real world temperature increases and so the resistance also increases. Therefore, the final answer is C.

Answer 2

Answer:

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✤ Required Answer:

✒ GiveN:

Cost price of a fan = Rs. 1200

Gain % = 8 %

✒ To Find:

Selling price of the fan....?

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✤ How to solve?

For solving this question, Let's note down some important formulae:

Selling price = Cost price + Gain/Profit

And, Profit % = Profit/CP × 100

Or else, Direct formula,

\large{ \boxed{ \rm{SP = \frac{CP(100 + p\%)}{100} }}}

SP=

100

CP(100+p%)

☃️ So, Let's try both the formulae, and solve the question

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✤ Solution:

Method 1:

We have,

Cost price = Rs. 1200

Gain % = 8 %

Finding gain/profit,

➝ Gain % = Gain/CP × 100

➝ 8 = Gain/1200 × 100

➝ 8 = Gain/12

➝ Gain = Rs. 96

Finding Selling price,

➝ Selling price = Cost price + Gain

➝ Selling price = Rs. 1200 + Rs. 96

➝ Selling price = Rs. 1296

☀️ Selling price of the fan = Rs. 1296

Method 2:

By using shortcut formula,

➝ Selling price = Cost price(100 + Gain%)/100

➝ Selling price = 1200(100 + 8)/100

➝ Selling price = 12 × 108

➝ Selling price = Rs. 1296

☀️ Here also, SP of the fan = Rs. 1296 only.

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