Why does the light bulb in a circuit turn on when you close the switch?
(a) the switch absorbs the electrical energy.
(b) the switch changes the circuit from series to parallel.
(c) closing the switch completes the circuit, making it a closed circuit.
(d) the switch changes the direction of the flow of electrons.

The correct answer is-

(C) Closing the switch completes the circuit, making it a closed circuit.

An electric circuit is a pathway made up of wires through which electrons flow. A power source ( such as battery) provides the force (voltage) that allows the electrons to move. When the electrons reach an electric device such as a light bulb, they provide it power to work.

It includes four basic components that are: A source of energy (AC or DC), a conductor that allows current to pass through ( such as copper wire), an electric device such as bulb, and a switch ( to control the circuit)

A closed circuit is considered as a complete circuit, meaning that there is continuous flow of electrons and electrons can flow all the way around from one end of a power source (such as battery) to the other end through conductor ( wire).

The circuit is completed on closing the switch, thus, light bulbs in the circuit.

a4 - 3a2 - 1

step-by-step explanation:

step   1   :

equation at the end of step   1   :

  ((a4) -   3a2) -   1

step   2   :

trying to factor by splitting the middle term

2.1     factoring   a4-3a2-1  

the first term is,   a4   its coefficient is   1 .

the middle term is,   -3a2   its coefficient is   -3 .

the last term, "the constant", is   -1