Question

Course Activity: Conserving Electricity at Home

Part C
This table lists the power in watts of some common appliances. Sometimes, we use two appliances at the same time.
According to the table, what is the total amount of watts used by a TV connected to a cable box?
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Part D
Look at the table again. What is the total number of watts used by a TV connected to a video game system?
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Part E
Take another look at the table. Do some appliances use power even when they're off?

Answer 1

Part C: According to the table, a TV uses 120 watts and a cable box uses 35 watts. If we assume that the TV and cable box are used at the same time, then the total amount of watts used would be:

Total watts = 120 watts + 35 watts = 155 watts

Therefore, a TV connected to a cable box would use 155 watts.

Part D: According to the table, a TV uses 120 watts and a video game system uses 95 watts. If we assume that the TV and video game system are used at the same time, then the total amount of watts used would be:

Total watts = 120 watts + 95 watts = 215 watts

Therefore, a TV connected to a video game system would use 215 watts.

Part E: Yes, some appliances use power even when they're off. These are often referred to as "phantom loads" or "vampire power." Examples of appliances that may use power when turned off include televisions, cable boxes, DVD players, and chargers for electronic devices. One way to reduce this standby power usage is to unplug appliances when they're not in use or use a power strip that can be turned off to cut power to multiple devices at once.