apes wee 6.13.37

Which is NOT a way to conserve energy?

• Using a desktop computer rather than a laptop
• Consolidating errands while to make fewer car tips
• Replacing incandescent bulbs with compact fluorescent bulbs
• Using a power strip for electronics
• Lowering thermostats during cold months

Tags

NGSS.MS-PS3-3

A tiered rate system for electricity use charges customers

• increasingly higher rates as the system uses more resources that are not renewable.
• different rates based on the square footage of the dwelling or business.
• lower rates for the first increments of electricity used and higher rates as usage rises.
• different rates based on peak usage times.
• according to their income status.

Use Table 13-1. If both LCD televisions are on for 4 hours per day for one month (30 days) how much less energy does the Energy Star television use during that time?

• 400 kWh

• 100 kWh

• 120 kWh

• 12 kWh

• 1.2 kWh

Tags

NGSS.MS-PS3-3

NGSS.MS-PS3-4

Use Table 13-1. If the cost of electricity is $0.10 per kWh and both LCD televisions are used for four hours per day for a year (365 days), how much less does the Energy Star model cost in electricity for that year?

• 480

• 146

• 120

• 14.6

• 1.46

Tags

NGSS.MS-PS3-3

NGSS.MS-PS3-4

Use Table 13-1. If a household watches television 4 hours per day for a year (365 days), how many more kWh will the plasma television use than the Energy Star television?

• 175 kWh

• 262 kWh

• 409 kWh

• 584 kWh

• 2453 kWh

Use Table 13-1. A community has 200,000 homes and 1 percent of those homes have plasma televisions. How many kWh of excess energy are being consumed in a year (365 days) by the households that use plasma televisions rather than Energy Star LCD televisions?

• 350,000 kWh

• 524,000 kWh

• 818,000 kWh

• 1,168,000 kWh

• 4.906,000 kWh

If a 100 W incandescent light bulb uses 360 kJ of energy per hour, and a compact fluorescent bulb uses as much, how much energy would a compact fluorescent bulb use in 30 minutes?

• 4.5 kJ
• 9 kJ
• 45 kJ
• 90 kJ
• 900 kJ

LED bulbs are six times as efficient as incandescent bulbs. If a household replaced ten 100-watt bulbs with LED bulbs, how many watts would be saved?

• 175 watts
• 400 watts
• 600 watts
• 833 watts
• 1,700 watts

A coal fired power plant is 33.3 percent efficient in converting the potential energy of coal into electricity. A nearby household receives 100 percent of its electricity from the coal fired power plant. After learning about energy conservation, the household reduces its electricity use by 200 kWh of electricity. How many kWh of the potential energy from coal would be conserved?

• 100 kWh
• 200 kWh
• 300 kWh
• 400 kWh
• 600 kWh

The property of building material that allows it to maintain heat or cold is called

• thermal mass.
• insulation.
• heat flow.
• energy star.
• conservation.