Question

What will be the electric current drawn by an electric bulb of 40W when it is connected to a source is 220V.​

Answer 1

$\Large{\boxed{\underline{\overline{\mathfrak{\star \: Question :- \: \star}}}}}$

❥ What will be the electric current drawn by an electric bulb of 40W when it is connected to a source is 220V ?

$\Large{\underline{\underline{\bf{AnSweR:-}}}}$

❥ As we know that

$\large{\boxed{\bold{Current\:( I )\:=\:0.18\:ampere}}}$

$\Large{\underline{\underline{\bf{GiVen:-}}}}$

✒ Power ( P ) ↠ 40 watts

✒ Voltage ( V ) ↠ 220 volts

$\Large{\underline{\underline{\bf{To find :-}}}}$

✒ Current ↠ ?

$\large{\boxed{\bold{Formula\: required}}}$

$\large{\boxed{\bold{P\:=\:V\:×\:I}}}$

$\Large{\underline{\underline{\bf{SoLuTion:-}}}}$

$\large{\boxed{\bold{P\:=\:V\:×\:I}}}$

✦ Here ,

✒ Power ( P ) ↠ 40 watts

✒ Voltage ( V ) ↠ 220 volts

✒ Current ( I ) ↠ ?

❥ Now ,

✒ putting these values in the above formula , we get :

✒ 40 ↠ 220 × I

✒ I ↠ 40/220

✒ I ↠ 0.18 ampere

$\large{\boxed{\bold{Current\:( I )\:=\:0.18\:ampere}}}$

∴ The current drawn by an electric bulb of 40W when it is connected to a source of 220V is 0.18A .

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☞ Extra shots :-

❃ Some other Formulae for Calculating Electric Power :-

✒ P ↠ I² × R

✒ P ↠ V² / R

✒ P ↠ V / I

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Answer 2

Answer:

$\Large{\boxed{\underline{\overline{\mathfrak{\star \: Question :- \: \star}}}}}$

What will be the electric current drawn by an electric bulb of 40W when it is connected to a source is 220V ?

$\huge\underline{\overline{\mid{\bold{\pink{ANSWER-}}\mid}}}$

$\yellow{\bigstar}$ $\large{\rm\purple{I = 0.18 Amps }}$

$\Large{\underline{\underline{\bf{GiVen:-}}}}$

Electric bulb has the Power ( P ) ↠ 40 watts

Voltage ( V ) of the bulb ↠ 220 volts

$\Large{\underline{\underline{\bf{To find :-}}}}$

what is the Current drawn ?

$\Large{\underline{\underline{\bf{SoLuTion:-}}}}$

So , here we go !

As per the given :+

By using the formula of power :-

Well , What is power ?

Power is the rate energy is moved, or used.

Power is the amount of energy transferred or converted per unit time. In the International System of Units, the unit of power is the watt, equal to one joule per second. In older works, power is sometimes called activity. Power is a scalar quantity.

$p \: = \frac{v}{i}$

Now , Let's find out current simply by applying formula :-

Now putting up the values in the required formula

40 = 220 × I

I = 40/220

I = 0.18 ampere

$\therefore\underline{\boxed{\textsf{I = {\textbf{0.18 amperes}}}}} \qquad\qquad \bigg\lgroup\bold{Current} \bigg\rgroup$

Additional Information :-

✦ What is Current ?

↠ Current is the rate at which electrons flow past a point in a complete electrical circuit. At its most basic, current = flow.

↠ It expresses the quantity of electrons (sometimes called "electrical charge") flowing past a point in a circuit over a given time.

✦ How to calculate Current ?

↠ Current is usually denoted by the symbol I. Ohm's law relates the current flowing through a conductor to the voltage V and resistance R; that is, V = IR. An alternative statement of Ohm's law is I = V/R.

✦ What is the unit of Charge and Electric Current ?

↠Unit of electric charge is coulomb or C, unit of electric current is ampere or A.

Note :-

Ohms Law and Power

$\sf\underline{\purple{\:\:\: \: \: To\: Find \: the \: Voltage ( V ) :- \:\:\:}}$[ V = I x R ] V (volts) = I (amps) x R (Ω)

$\sf\underline{\pink{\:\:\: \: \: To\: Find \: the \: Current ( I ) :- \:\:\:}}$ [ I = V ÷ R ] I (amps) = V (volts) ÷ R (Ω)

$\sf\underline{\purple{\:\:\: \: \: To\: Find \: the \: Resistance (R ) :- \:\:\:}}$ [ R = V ÷ I ] R (Ω) = V (volts) ÷ I (amps)

$\sf\underline{\pink{\:\:\: \: \: To\: Find \: the \: Power ( P ) :- \:\:\:}}$ [ P = V x I ] P (watts) = V (volts) x I (amps)

✮ What is Resistance ?

Resistance refer to the property of materials that allow the flow of electric current. Resistance certainly opposes the flow of current. Furthermore, the unit of resistance is ohms which is represented by the Greek uppercase letter omega Ω.

✮ Formula for Resistance ?

Resistance = voltage drop across a resistor/ current flowing through a resistor

R = \(\frac{V}{I}\)

R = resistance (Ohms, Ω)

V = voltage difference which is between the two ends of a resistor (Volts, V)

I = the current which flows through a resistor (Amperes, A)

✮ Formula to find resistance in a series circuit ?

Series circuits

The total resistance of the circuit is found by simply adding up the resistance values of the individual resistors: equivalent resistance of resistors in series :

R = R1 + R2 + R3 + ...

A series circuit is shown in the diagram above. The current flows through each resistor in turn.

✮ Formula to find resistance in a parallel circuit ?

You can find total resistance in a Parallel circuit with the following formula:

1/Rt = 1/R1 + 1/R2 + 1/R3 +..

Note :-

If one of the parallel paths is broken, current will continue to flow in all the other paths.

The total resistance of a parallel circuit is NOT equal to the sum of the resistors (like in a series circuit).