Because there are no significant amounts of electricity in nature - at least, not in a form that can be used. (No way has yet been found to harness the energy from lightning.)
electricity
Depends what the source of electricity is.
Electricity
solar
Solar panels are used to make electricity. The energy that panels use to make energy therefore is solar energy.
No.
A computers energy source is electricity. When using a computer plugged in or not it is drawing electricity from the battery or from a plug which is connected into the PC and a wall outlet. When there is no electricity the computer cannot function.
Some use electricity, most use gasoline.
a current of water to move the energy producing aparatus.
Electricity is the naturally occurring source of energy that we are yet not able to harness and use.
Solar
Sometimes, but electricity isn't an energy SOURCE; it's an energy CONDUIT. Electricity is how we get energy from one place to another, and how we use it when it gets there. Electricity doesn't stand still; at least, not naturally. We generate electricity with generators that use some other power source to spin a turbine; a jet engine, for example, or falling water, or steam. The electricity goes through a wire to where we use it by converting it into some other form; light, or heat, or music, or radio transmissions. We can store electricity in a battery, but that's a very inefficient process so far. And the electricity doesn't really do us any good until we convert it into something else.