Energy Efficiency
What word describes energy that is not useful for the intended task?
Wasted
What type of energy source cannot be replaced quickly?
Non-renewable
What type of circuit has only one pathway?
Series
The formula linking voltage, current and resistance is ________.
V=IR
More stars indicate higher energy ________.
Efficiency
In an inefficient device, most energy is usually transformed into ____
Heat
What gas is released when fossil fuels burn?
CO2
What type of circuit provides the same voltage to each branch?
Parallel
What happens to current if resistance increases (V constant)?
Decreases
Energy ratings compare appliances based on energy ________.
Consumption
The ratio of useful output energy to total input energy is called
Efficiency
Renewable energy sources are more ________.
Sustainable
What term describes the movement of charge?
Current
Calculate current: 12 V, 6 Ω
2 A
Higher star ratings reduce long-term ________ costs.
Running
What diagram shows energy input, useful output and wasted output?
Snakey
What factor limits solar energy at night?
Sunlight
In a series circuit, adding components makes bulbs ________.
Dimmer
Calculate resistance: 9 V, 3 A
3 Ω
Energy star ratings help reduce greenhouse ________.
Emissions
If useful energy output increases while input stays constant, efficiency _______
Increases
What energy transformation occurs in a wind turbine?
Kinetic→Electrical
In a parallel circuit, total resistance ________ as branches increase.
Decreases
If voltage doubles and resistance halves, current ________.
Quadruples
What unit appears on energy bills for electricity use?
kWh