Question
A bulb is connected across a battery of 10 V for 20 seconds. If a current of 2 A flows through it, calculate the heat energy generated by the bulb.
This question was previously asked in
RRB NTPC 2024 Undergraduate CBT 1 Question Paper (29-Aug-2025) (Shift 1)
The correct answer is
400 J
The heat energy generated by the bulb can be calculated using the formula for electrical power and energy:
Power (P) = Voltage (V) × Current (I)
Given:
- Voltage (V) = 10 V
- Current (I) = 2 A
Therefore, the power consumed by the bulb is:
P = 10 V × 2 A = 20 W
Energy (E) = Power (P) × Time (t)
Given:
- Power (P) = 20 W
- Time (t) = 20 s
Therefore, the heat energy generated by the bulb is:
E = 20 W × 20 s = 400 J
Thus, the correct answer is 400 J.
Was this answer helpful?
Similar Questions
- An 8 Ω resistor generates 200 J of heat every second. What is the potential difference across the resistor?
- An electric bulb is connected to a 200 V generator. The current is 0.5 A. The power of the bulb is
- If Power = 100 watt and Resistance =4 ohms, then Current (I) =________?
- 450V bulb passes a current of 0.4A. Calculate the power in the lamp.
- When the potential difference across a resistive conductor of resistance R obeying ohm's law, is doubled, the rate of generation of heat will become
Important Questions from Power in Electric Circuits
Two electric bulbs marked 25 W - 220 V and 100 W - 220 V are connected in series with 440 V supply. Which of the bulb will fuse?
- Two electric bulbs are rated '$220$ V, $100$ W' and '$220$ V, $50$ W' respectively.
If these two bulbs are connected in series across a $220$ V supply, what will be the power consumed by the $100$ W bulb? - Three identical bulbs are connected in parallel to a battery of 6 V. If the current in the circuit is 0.6 A, the power dissipated by the battery is:
- An 8 Ω resistor generates 200 J of heat every second. What is the potential difference across the resistor?
- The charge flowing through a resistance $R$ varies with time $t$ as $Q = At^2 - Bt^3$, where $A$ and $B$ are positive constants. The total heat produced in $R$ until the current becomes zero is:
Need Expert Advice?
Test Series
Railways
RRB ALP 2026 Mock Test series
1035 Tests 1 Tests Free
1711 Attempts
4.3(257)
English, Hindi
More Questions from RRB ALP
