21. A student takes out an electric motor from a battery operated toy.
He connects it to a wheel, a switch and 3 volt battery as shown
in the diagram. How can he decrease or increase the speed of
the wheel without changing the battery? Give reason for your
answer
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REPORTS & MULTIMEDIA / EXPLAINER
How Do Battery Electric Cars Work?
Published Feb 25, 2015 Updated Mar 12, 2018
Battery electric vehicles, or BEVs, use electricity stored in a battery pack to power an electric motor and turn the wheels.
When depleted, the batteries are recharged using grid electricity, either from a wall socket or a dedicated charging unit. Since they don’t run on gasoline or diesel and are powered entirely by electricity, battery electric cars and trucks are considered “all-electric” vehicles.
When driven, BEVs don’t produce tailpipe pollution—they don’t even have a tailpipe. However, the electricity they use may produce heat-trapping gases and other pollution at the source of its generation or in the extraction of fossil fuels. The amount of pollution produced depends on how the electricity is made. In the United States, battery electric cars charged off the dirtiest coal-dominated grid still produce less pollution than their gasoline-powered counterparts. BEVs powered by renewable energy sources like wind or solar are virtually emission-free.
Not using gasoline or diesel also means that battery electric cars are significantly cheaper to fuel than conventional vehicles. Exact comparisons depend on the vehicle model and fuel prices, but driving a BEV can save drivers over $1,000 annually in gasoline money.
Explanation:
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l don't know whether it is right or worng
rheostat should be add in the circuit