
An electric lamp of , a toaster of resistance and a water filter of resistance are connected in parallel to a 220V source. What is the resistance of an electric iron connected to the same source that takes as much current as all three appliances and what is the current through it?
Answer
503.7k+ views
Hint: To solve this question, use Ohm’s law. Firstly, find the current flowing through all the three appliances i.e. electric lamp, toaster and a water filter individually. Sum of the current of all these three appliances will give the total current flowing through the electric iron. Thus, add all the currents to get the total current. Using this obtained total current and given source voltage, calculate the resistance of an electric current.
Complete answer:
Given: Voltage (V)= 220V
Resistance through electric lamp=
Resistance through toaster=
Resistance through water filter=
According to Ohm’s law.
Where, V is the potential difference
I is the current flowing
R is the resistance
Rearranging above equation we get,
Thus, current I flowing through electric lamp can be calculated by substituting values in above equation, we get,
Similarly, current through the toaster is,
Current through the water filter is given by,
Thus, the total current is,
Substituting the values we get,
Resistance of the electric iron can be calculated by,
Substituting values in above equation we get,
Therefore, resistance of the electric iron is and current flowing through it is .
Note:
Resistance depends on the type of material as well as its dimensions i.e. area of cross-section. Materials offering very high resistance are called Insulators. While, the materials offering very low resistance are called Conductors. Greater the value of resistance, smaller is the flow of current through the material. The relation between applied voltage and current depends on the sign of the voltage. If I is the current for a certain value of voltage V, then reversing the direction of V does not produce the current of same magnitude as the I in the opposite direction.
Complete answer:
Given: Voltage (V)= 220V
Resistance through electric lamp=
Resistance through toaster=
Resistance through water filter=
According to Ohm’s law.
Where, V is the potential difference
I is the current flowing
R is the resistance
Rearranging above equation we get,
Thus, current I flowing through electric lamp can be calculated by substituting values in above equation, we get,
Similarly, current through the toaster is,
Current through the water filter is given by,
Thus, the total current is,
Substituting the values we get,
Resistance of the electric iron can be calculated by,
Substituting values in above equation we get,
Therefore, resistance of the electric iron is
Note:
Resistance depends on the type of material as well as its dimensions i.e. area of cross-section. Materials offering very high resistance are called Insulators. While, the materials offering very low resistance are called Conductors. Greater the value of resistance, smaller is the flow of current through the material. The relation between applied voltage and current depends on the sign of the voltage. If I is the current for a certain value of voltage V, then reversing the direction of V does not produce the current of same magnitude as the I in the opposite direction.
Recently Updated Pages
Master Class 12 Business Studies: Engaging Questions & Answers for Success

Master Class 12 Economics: Engaging Questions & Answers for Success

Master Class 12 Maths: Engaging Questions & Answers for Success

Master Class 12 Biology: Engaging Questions & Answers for Success

Master Class 12 Physics: Engaging Questions & Answers for Success

Master Class 12 English: Engaging Questions & Answers for Success

Trending doubts
a Tabulate the differences in the characteristics of class 12 chemistry CBSE

Why is the cell called the structural and functional class 12 biology CBSE

Which are the Top 10 Largest Countries of the World?

Differentiate between homogeneous and heterogeneous class 12 chemistry CBSE

Derive an expression for electric potential at point class 12 physics CBSE

Who discovered the cell and how class 12 biology CBSE
