A direct current of 4 A and an alternating current of peak value 4 A flow through resistance of 3 Ω and 2 Ω respectively. The ratio of heat produced in the two resistances in same interval of time will be :
- 3 : 2
- 3 : 1
- 3 : 4
- 4 : 3
The Correct Option is B
Solution and Explanation
The correct answer is (B) : 3 : 1
Ratio\(\frac{i_{1}^{2} R_1}{\left(\frac{i_2}{\sqrt{2}}\right)^2 R_2} \)
\(=\frac{4^2×3}{(\frac{4}{\sqrt{2}})^2×2}\)
\(⇒Ratio=3:1\)
Top Questions on Current electricity
- Find the equivalent resistance between two ends of the following circuit:
- JEE Main - 2025
- Physics
- Current electricity
- \( n \) identical cells, each of e.m.f \( E \) and internal resistance \( r \), are connected in series. Later on, it was found that two cells ‘X’ and ‘Y’ are connected in reverse polarities. Calculate the potential difference across the cell ‘X’.
- CBSE CLASS XII - 2025
- Physics
- Current electricity
- For mass 20 kg, torque \( \tau = 5 \, \text{Nm} \), find angular acceleration \( \alpha \).
- AIIMS Paramedical - 2025
- Physics
- Current electricity
- If current drops from 4 A to 0 A in 0.5 s, and voltage is 120 V, find the self-inductance.
- AIIMS Paramedical - 2025
- Physics
- Current electricity
- Given \( E(t) = 108t - 22 \), how is velocity derived from the electric field?
- AIIMS Paramedical - 2025
- Physics
- Current electricity
Questions Asked in JEE Main exam
- The value of \( (\sin 70^\circ)(\cot 10^\circ \cot 70^\circ - 1) \) is:
- JEE Main - 2025
- Trigonometric Identities
If A and B are two events such that \( P(A \cap B) = 0.1 \), and \( P(A|B) \) and \( P(B|A) \) are the roots of the equation \( 12x^2 - 7x + 1 = 0 \), then the value of \(\frac{P(A \cup B)}{P(A \cap B)}\)
- JEE Main - 2025
- Probability
- The sum of all local minimum values of the function \( f(x) \) as defined below is:
\[ f(x) = \begin{cases} 1 - 2x & \text{if } x < -1, \\[10pt] \frac{1}{3}(7 + 2|x|) & \text{if } -1 \leq x \leq 2, \\[10pt] \frac{11}{18}(x-4)(x-5) & \text{if } x > 2. \end{cases} \]- JEE Main - 2025
- Functions
- Number of functions \( f: \{1, 2, \dots, 100\} \to \{0, 1\} \), that assign 1 to exactly one of the positive integers less than or equal to 98, is equal to:
- JEE Main - 2025
- Vectors
Match List - I with List - II:
List - I:
(A) Amylase
(B) Cellulose
(C) Glycogen
(D) Amylopectin
List - II:
(I) β-C1-C4 plant
(II) α-C1-C4 animal
(III) α-C1-C4 α-C1-C6 plant
(IV) α-C1-C4 plant
- JEE Main - 2025
- Carbohydrates
Concepts Used:
Current Electricity
Current electricity is defined as the flow of electrons from one section of the circuit to another.
Types of Current Electricity
There are two types of current electricity as follows:
Direct Current
The current electricity whose direction remains the same is known as direct current. Direct current is defined by the constant flow of electrons from a region of high electron density to a region of low electron density. DC is used in many household appliances and applications that involve a battery.
Alternating Current
The current electricity that is bidirectional and keeps changing the direction of the charge flow is known as alternating current. The bi-directionality is caused by a sinusoidally varying current and voltage that reverses directions, creating a periodic back-and-forth motion for the current. The electrical outlets at our homes and industries are supplied with alternating current.