CBSE Guess > Papers > Important Questions > Class X > Science > Electricity and Its Heating and Chemical Effect Electricity and Its Heating and Chemical Effect
Q. 127. What is coulomb’s law? Q. 128. Define the magnitude and unit of current. Q. 129. What is electric current? Write the mathematical expression to calculate potential difference between two points. Q. 130. What do you understand by electric potential? Define electric potential at any print. Q. 131. What is an ammeter and a voltmeter? How are they connected in a circuit? Q. 132. How electric current flows in a conductor? Q. 133. State and explain Ohm’s How is it verified in the laboratory. On the basis of Ohm’s law, define ampere and volt. Q. 134. Define resistivity and give its unit. A piece of wire is redrawn by pulling it until its length is doubled. Compare the new resistance with the original value. Q. 135. Define electric power. State its units. What is commercial lunit of electrical energy? Express it into joules. Q. 136. Find the equivalent resistance of different resistances in (i) serees and (ii) parallel. Q. 137. Write the applications of electrolysis. Describe the electrolysis of water. Q. 138. Describe construction and working of a dry cell Q. 139. Write different types of electro-chemical cells. Describe in detail the storage cells or accumulators. Q. 140. State the Faraday’s first law of electrolysis. Define one Faraday. Q. 141. State the Faraday’s second law’s of electrolysis with proper example.
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