10.3 Electrical Power and Energy

Cards (156)

  • What is the formula to calculate electrical power using current and resistance?
    P=P =I2R I^{2}R
  • What is the formula to calculate electrical energy using current, voltage, and time?
    E=E =IVt IVt
  • The symbol for electrical power is P
  • The formula P=P =IV IV relates power to voltage and current
  • The electrical power formula P=P =I2R I^{2}R uses current and resistance to calculate power.

    True
  • The symbol for electrical power is P
  • In the formula P=P =V×I V \times I, the unit for voltage is volts
  • The formula P=P =I2R I^{2} R calculates power using current and resistance
  • The unit of electrical energy is the joule
  • A 60-watt light bulb left on for 5 minutes consumes 18,000 joules
  • What is measured in watts?
    Rate of energy conversion
  • How much electrical energy does a 100-watt light bulb consume in 30 minutes?
    180,000 joules
  • What is the unit of electrical power?
    Watt
  • What is the power consumed by a light bulb operating at 230V and drawing 0.5A?
    115 watts
  • What is the formula to calculate power using current and resistance?
    P=P =I2R I^{2} R
  • A device with a voltage of 120V and a resistance of 20 ohms consumes 720W
    True
  • How much electrical energy does a 100-watt light bulb consume if left on for 30 minutes?
    180,000 joules
  • A 100-watt light bulb left on for 30 minutes consumes 180,000 joules of electrical energy.

    True
  • What does power measure in electrical contexts?
    Rate of energy conversion
  • What is the unit for voltage?
    Volts (V)
  • What are the variables required to calculate electrical energy using E=E =I2Rt I^{2} Rt?

    Current, resistance, time
  • Electrical power is the rate at which electrical energy is converted into other forms of energy.
    True
  • A light bulb operating at 230V and 0.5A consumes 115 watts of electrical power.

    True
  • A hairdryer operating at 230V and 10A consumes 2300 watts of power.

    True
  • What is the unit of current?
    Amperes (A)
  • The symbol for electrical power is PP
    True
  • The symbol for resistance is RR
    True
  • The unit of voltage is the ampere.
    False
  • The formula to calculate electrical energy is E=E =Pt Pt
    True
  • A 100-watt light bulb left on for 30 minutes consumes 180,000 joules of electrical energy.

    True
  • A device operating at 120V and 2A for 5 minutes consumes 72,000 joules of electrical energy.

    True
  • What is the unit of voltage in the formula E=E =IVt IVt?

    Volts
  • A device operates at 120V and draws 2A for 5 minutes. What is the electrical energy consumed?
    72,000 J
  • A device operating at 120V draws 2A for 5 minutes. How much electrical energy is consumed?
    72,000 J
  • Electrical power can be calculated using the formula P = V^{2}/R</latex>.
    True
  • Match the variable with its unit:
    Power ↔️ Watts (W)
    Energy ↔️ Joules (J)
  • What is the formula to calculate electrical power using voltage and current?
    P = V × I</latex>
  • What is the power of a hairdryer operating at 230V and drawing 10A?
    2300W
  • In the formula P=P =I2R I^{2}R, the resistance is measured in ohms
  • The unit of electrical power is the watt (W).

    True