5.2.2 Power

• The formula for power is: Power = Work Done / Time Taken
• Work done and power are the same concept in physics.

  False
• What are the two formulas for calculating power?

  Power = Work Done / Time ||| Power = Force x Velocity
• Match the formula with its meaning:

  Power = Work Done / Time ↔️ Power is the rate of energy transfer

  Power = Force x Velocity ↔️ Power is the product of force and velocity
• What is the definition of power in physics?

  Rate of energy transfer
• In what units is power measured?

  Watts
• Arrange the steps to solve a numerical problem related to power:

  1️⃣ Identify the given values

  2️⃣ Choose the correct formula

  3️⃣ Substitute the values

  4️⃣ Calculate the power
• The formula Power = Force x Velocity shows that power is the product of the applied force and the velocity
• What is the formula for calculating power using work done and time taken?

  Power = Work Done / Time Taken
• Work done is measured in joules.


  True
• If 100 joules of work are done in 5 seconds, the power is 20 watts.
• What is the symbol for work done?

  W
• Watts (W) represent the rate of energy transfer or work done.


  True
• The unit for power is watts.
• Power is the rate at which work is done or energy is transferred.

  True
• What are the units for power, work done, and time taken in the formula Power = Work Done / Time Taken?

  Watts, Joules, Seconds
• The formula for power using work done and time taken is: Power = Work Done / Time Taken.
• Power is the rate of energy transfer or work done
• Match the quantity with its unit:

  Power ↔️ Watts (W)

  Work Done ↔️ Joules (J)

  Time Taken ↔️ Seconds (s)
• If a motor does 600 joules of work in 10 seconds, what is its power?

  60 W
• Power is measured in the unit of watts
• In what unit is time taken measured?

  Seconds
• Power is the rate of energy transfer or work done.


  True
• Time taken is represented by the symbol t.
• If an appliance uses 500 joules of energy in 10 seconds, what is its power?

  50 W
• What is the formula that relates power, work done, and time taken?

  Power = Work Done / Time
• If a motor does 600 joules of work in 10 seconds, its power is 60 watts.
• Power is measured in watts.


  True
• If a motor does 600 joules of work in 10 seconds, what is its power?

  60 W
• What is the formula for calculating power?

  Work Done / Time Taken
• Work Done is measured in watts (W).

  False
• One watt is equivalent to one joule per second
• What is the formula for calculating work done?

  Force x Displacement
• Match the formula with its use:

  Power = Work Done / Time Taken ↔️ When work done and time are known

  Power = Force x Velocity ↔️ When force and velocity are given
• Understanding power efficiency is important to minimize energy consumption.


  True
• What does the unit watt measure?

  Rate of energy transfer
• Work Done is calculated as Force times Displacement
• A motor does 3000 J of work in 10 seconds. Calculate its power.

  300 W