Cards (65)

    • What is the definition of power?
      The rate of energy transfer
    • Power is measured in watts
    • One watt is equivalent to one joule per second.
    • What is the formula for calculating power using voltage and current?
      P=P =VI VI
    • In the formula P=P =VI VI, the variable VV represents voltage
    • In the formula P=P =VI VI, the variable II represents current, measured in amperes.
    • Match the power formula with its variables:
      P=P =Et \frac{E}{t} ↔️ Energy, Time
      P=P =VI VI ↔️ Voltage, Current
    • What is the unit for voltage in the power formula P=P =VI VI?

      Volts
    • The formula P=P =Et \frac{E}{t} uses the variables energy and time
    • If a device operates at 12 V and draws 2 A, what is its power consumption?
      24 W
    • What is the unit of power?
      Watt
    • The current is measured in amperes
    • The formula for power using energy and time is P = \frac{E}{t}</latex>
    • Match the formula with its variables and units:
      P=P =VI VI ↔️ Voltage, Current, W = V*A
      P=P =Et \frac{E}{t} ↔️ Energy, Time, W = J/s
    • What is the power consumption of a device operating at 12 V and drawing2 A?
      24 W
    • To calculate power using voltage and current, the formula is P = VI
    • The formula P=P =VI VI is derived from the definitions of voltage and current
    • What is the unit of voltage?
      Volt
    • Arrange the variables in the correct order for the formula P=P =Et \frac{E}{t}
      1️⃣ Energy
      2️⃣ Time
      3️⃣ Power
    • What are the units for energy and time in the formula P=P =Et \frac{E}{t}?

      J and s
    • In the formula P=P =Et \frac{E}{t}, EE represents energy
    • Match the variable with its symbol and units:
      Power ↔️ PP, Watts
      Energy ↔️ EE, Joules
      Time ↔️ tt, Seconds
    • What is the power of a light bulb that transfers 600 joules of energy in 30 seconds?
      20 W
    • 1 watt is equal to 1 joule per second
    • What is the definition of a watt?
      Joule per second
    • To calculate power using voltage and current, the formula is P = VI
    • What is the power consumption of a device operating at 12 V and drawing 2 A?
      24 W
    • In the formula P=P =Et \frac{E}{t}, what does EE represent?

      Energy
    • A light bulb that transfers 600 joules of energy in 30 seconds has a power of 20 W
    • Match the variable with its symbol and units:
      Power ↔️ PP, Watts
      Energy ↔️ EE, Joules
      Time ↔️ tt, Seconds
    • The formula to calculate power using voltage and current is P = VI
    • What is the power consumption of a kettle operating at 230 V and drawing 10 A?
      2300 W
    • Power can be calculated using either voltage and current or energy and time
    • What is the formula to calculate efficiency?
      \text{Efficiency} = \frac{\text{Output Power}}{\text{Input Power}} \times 100%</latex>
    • An LED light bulb with 10 W input power and 8 W output power has an efficiency of 80%
    • 1 watt is equivalent to 1 joule per second
    • Which formula is used to calculate power using energy and time?
      P=P =Et \frac{E}{t}
    • What does the variable xx represent in this study material?

      Work done
    • The variable tt represents time
    • Match the power unit with its symbol and definition:
      Watt ↔️ W | Energy transfer of 1 joule per second
      Joule per second ↔️ J/s | Equivalent to 1 watt