Complete this sentence ....
All materials contain negatively-charged particles called______________________
electrons
Electric current is a measure of what ?
Current is a measure of how much electric charge flows through a circuit.
In a series circuit, how many paths are there for electrons to follow ?
only one.
What is two things are needed for electricity to flow through a wire or other component.
●something to transfer energy to the electrons, such as a battery or power pack
●a complete path for the electrons to flow through
What is an elctrical insulator ?
An electrical insulator is omething that does not allow electrical current to flow through it
In metals the electrons are free to move, which means they are good _____________ of electricity.
conductors
What is used to measure electric current ?
An ammeter
What happens to the brigtness of a lamp if another lamp is added to a series circuit ?
Adding another lamp in a series circuit results in a decrease in brightness for all lamps.
Complete the sentence: As electrons flow through a circuit, they lose ________.
As electrons flow through a circuit, they lose energy.
Name two examples of electrical insulators [material not object]
rubber, glass, plastic, dry wood, ceramic, porcelain, mica, oil, dry cotton, and diamond
_______ do not conduct electricity
insulators
What are the units for electric current ?
amperes or amps
What happens if a component in a series cricuit breaks ?
If a component or wire break the circuit is broken and current cannot flow.
What does the current in a series circuit depends upon ?
The current in a series circuit depends upon the number of cells.
What electrical property do metals have ?
metals have very low resistance
If there is a complete circuit a ______________ can push electrons all around the circuit.
battery
What is the symbol for electric current ?
A
If you mave an ammeter to different positions in a series circuit, what will the ammeter show ?
The current has the same value everywhere in a series circuit.
It does not matter where you put the ammeter, it will give you the same reading.
What type of electrical property do insulators have ?
the electrical property that insulators haveis high resistamce
Name three examples of electrical components.
cell, battery, lamp, resistir, switches, fuses, batteries, motors, buzzer, [ammeter]
An electric current is a flow of ________
charge
How is an ammeter connected to a circuit when it is used ?
current connected in series [acting the same as a wire in the circuit].
Why does adding another lamp in a series circuit results in a decrease in brightness for all lamps ?
Adding another lamp in a series circuit results in a decrease in brightness for all lamps because it increases the resistance, causing the total current to decrease. Because of the lower current, each lamp receives less voltage, resulting in a decrease in brightness for all lamps.
Why are insulators used to cover electrical wires?
Insulators (like plastic, PVC, or rubber) are used to cover electrical wires to prevent electric shock, stop short circuits, and protect wires from environmental damage.
What is a cell in an electrical circuit?
A cell in an electrical circuit is a device that converts stored chemical energy into electrical energy, acting as a power source to produce a potential difference (voltage). It pushes electric charges around a circuit.