Power and Energy Problems

Is the amount of energy being transferred over a period of time.

• Power
• Energy
• Seconds
• Joules

What is the unit of measurement for power?

• Joules
• Watts
• Voltage
• Calories

How much energy does this appliance transfer per second?

• 240 V
• 50 Hz
• 150 W
• N533

A microwave has a power rating of 1550 W. How much energy does it transfer per second?

• 1.550 Joules
• 15.50 Joules
• 155.0 Joules
• 1550 Joules

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Which type of appliances transfer the most energy per second?

• Those that transfer energy into heat.
• Those that transfer energy into light.
• Those that transfer energy into sound.
• Those that transfer energy into movement.

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Which appliance transfers the most energy per second? 

• Clock
• Lamp
• Desktop Computer
• Iron

What are we paying electrical companies?

• The power of the appliance per hour of use.
• We electricity used per hour. 
• The impact of electricity use on the environment.
• The efficiency of the appliance.

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What is the unit of energy that electrical companies use?

• kJ
• kW
• kJ/hour
• kW/hour

A kettle transfers 1000J of energy every 2 seconds. Calculate its power.

• 2000 Watts
• 1000 Watts
• 500 Watts
• cannot be determined

Which of the following will help us cut on electricity bills?

• Using high power appliances longer.
• Using high power appliances less often.
• Using appliances that produce heat energy.
• Using less efficient appliances.

Tags

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