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heard of since heard since heard before heard of before
came to power; taken place came to power; been taken place coming to power; been taken place coming to power; taken place
was in power is in power came to power came in power
effect advantage disadvantage concern
control force power charge
the sum of the powers used in each load （resistor） divided by the number of loads always less than the power used in the smallest load the sum of the powers used in each individual load never more than the power usedin the largest load
should represent the public interest was created to serve the same goals as low power radio is the national authority on public broadcasting had always supported low-power radio in the past
burning fossil fuels to make electricity is widely used wind power is a widespread way to make electricity energy problems will soon be solved nuclear energy will solve all the energy problems we are facing
Fossil fuels should be encouraged to use to make electricity Not all the areas could use wind power. Solar energy costs the most Using nuclear energy will not produce negative effect.
The Importance of Electricity The Pollution of Making Electricity from Fossil Fuels The Advantage of Using Nuclear Energy Means of Making Electrical Power
in series with the power source and load in parallel with the power source and load insuring correct polarity using the lowest range possible to prevent instrument damage
Wind power Fossil fuels Solar power Water power
A. came into power was in power came into the power was in the power
since after unless before
is was has been had been
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