Electricity Flashcards
Electricity
What is electricity?
Electricity is the flow of electric charge, typically through conductors.
True or False: Electricity can be static or current.
True
What unit is used to measure electric current?
Ampere (A)
Fill in the blank: Voltage is measured in _______.
Volts
What is the formula for calculating power?
Power (P) = Voltage (V) x Current (I)
True or False: A circuit must be closed for electricity to flow.
True
What is the role of a resistor in a circuit?
A resistor limits the flow of electric current.
Which of the following materials is a good conductor of electricity? (A) Wood (B) Copper (C) Plastic
B) Copper
What is the difference between AC and DC current?
AC (Alternating Current) changes direction periodically, while DC (Direct Current) flows in one direction.
Fill in the blank: The device used to measure electric current is called an _______.
Ammeter
What does a battery do in a circuit?
A battery provides the voltage needed to push current through the circuit.
True or False: Insulators allow electric current to flow easily.
False
What is Ohm’s Law?
Ohm’s Law states that Voltage (V) = Current (I) x Resistance (R).
What is the unit of resistance?
Ohm (Ω)
Multiple choice: Which component stores electrical energy? (A) Resistor (B) Capacitor (C) Switch
B) Capacitor
What happens to the current if the resistance increases while the voltage remains constant?
The current decreases.
Fill in the blank: The flow of electric charge is called _______.
Current
What is a series circuit?
A series circuit is a circuit where components are connected in a single path.
What is a parallel circuit?
A parallel circuit is a circuit where components are connected across common points, providing multiple paths for current.
True or False: In a series circuit, if one component fails, the entire circuit stops working.
True
What is the primary function of a switch in a circuit?
A switch opens or closes a circuit to control the flow of electricity.
Fill in the blank: The part of the atom that carries a positive charge is called a _______.
Proton
What is a common use of electrical energy in homes?
Lighting, heating, and powering appliances.
Multiple choice: Which of the following is a safety device used in electrical circuits? (A) Fuse (B) Capacitor (C) Diode
A) Fuse
What is a short circuit?
A short circuit occurs when electricity takes an unintended path, often causing excessive current flow.
What is the purpose of a circuit breaker?
A circuit breaker automatically stops the flow of electricity to prevent damage or fire.
True or False: Electrons carry a negative charge.
True
What is static electricity?
Static electricity is the accumulation of electric charge on the surface of objects.
Fill in the blank: A _______ is a device that converts electrical energy into mechanical energy.
Motor
What is the effect of increasing voltage in a circuit?
Increasing voltage increases the current if resistance remains constant.
Multiple choice: Which of the following is NOT a method of generating electricity? (A) Solar (B) Wind (C) Concrete
C) Concrete
What is the purpose of grounding in electrical systems?
Grounding provides a safe path for excess electricity to prevent shock or fire.
True or False: All materials can conduct electricity.
False
What is the main function of a transformer?
A transformer changes the voltage of electricity.
Fill in the blank: The flow of electricity is often compared to the flow of _______.
Water
What is a load in an electrical circuit?
A load is any component that consumes electrical energy, such as a light bulb or appliance.
Multiple choice: What is the primary source of energy for most electricity generation? (A) Fossil Fuels (B) Wind (C) Geothermal
A) Fossil Fuels
What does the term ‘electrical efficiency’ refer to?
The ratio of useful output of energy to the total input of energy.
True or False: Voltage is the pressure that pushes electric charges through a circuit.
True
What is the primary use of a diode in a circuit?
A diode allows current to flow in one direction only.
Fill in the blank: The device that converts electrical energy into light is called a _______.
Light bulb
What is renewable energy?
Renewable energy is energy derived from natural processes that are replenished constantly, like solar and wind.
What does ‘electrical insulation’ do?
Electrical insulation prevents the flow of electric current to unintended areas.
True or False: Power is the rate at which electrical energy is transferred.
True
