Dev Kumar
  • 3

An electric motor takes 5 A from a 220 V line. Determine the power of the motor and the energy consumed in 2 h.

  • 3

NCERT Solution for Class 10 Science Chapter 12
Electricity
NCERT Books for Session 2022-2023
CBSE Board and UP Board
Intext Questions
Page No-220
Questions No-2

Share

4 Answers

  1. Power of the electric motor is given by
    P = VI
    Where, V = 220 V and I = 5 A
    So, Power P = 220 × 5 = 1100 W
    Now, the energy consumed = Power × time
    Where, P = 1100 W
    t = 2 hours = 2 × 60 × 60 seconds = 7200 seconds
    So, the energy consumed E = 1100 × 7200 J = 7920000 J

    For more answers visit to website:
    https://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-12/

    • 2
  2. Here, I = 5 A, V = 220 V, t = 2h = 7,200 s
    Power, P = V I = 220 x 5 = 1100 W
    Energy consumed = P x t = 1100 W x 7200 s = 7,920,000 J

    • 2
  3. Given, Electric current (I) = 5A,

    Potential difference (V) = 220V,
    Time (t) = 2h = 2 x 60 x 60 s = 7200 s
    Power (P) =?
    Energy consumed =?
    We know that, P = VI = 220V × 5A = 1100W
    We know that energy consumed by the electric appliance = P × t
     Energy consumed = 1100 W × 7200 s = 7920000 J = 7.92 × 106 J

    • 1
  4. Power Calculation:
    The power (P) of an electrical device can be calculated using the formula:
    P = 1 . V
    Where:
    » P is the power (in watts),
    » I is the current (in amperes),
    » V is the voltage (in volts).

    Given:
    I = 5 A (current)
    V = 220 V (voltage)
    substitute these values into the formula:

    P = 5 A . 220V
    P = 1100 W

    So, the power of the motor is 1100W.

    Energy Consumption Calculation:
    The energy (E) consumed by the motor can be calculated using the formula:
    E = P . t
    where:

    » E is the energy consumed (in watt-hours),
    » P is the power (in watts),
    » t is the time (in hours).
    Given:
    P = 1100 W (power)
    t = 2h (time)

    Substitute these values into the formula:

    E = 1100 W . 2 h
    E = 2200 Wh
    So, the energy consumed by the motor in 2 hours is 2200 Wh or 2.2 kWh.

    • 0
Leave an answer

Leave an answer

Browse