Electricty Flashcards
What is mains electricity?
Mains electricity is the primary source of electrical power supplied to homes and businesses.
What are frayed cables?
Frayed cables are damaged electrical wires that can pose a safety hazard.
What happens with an overloaded plug?
An overloaded plug may melt, leading to potential fire hazards.
What is the purpose of the live lead pin in a plug?
The live lead pin carries the current to the appliance.
What is the function of the earth wire?
The earth wire protects against electric shock.
What does a fuse do?
A fuse melts if too much current flows, preventing fire hazards.
What are the common fuse ratings?
Common fuse ratings are 3 Amps, 5 Amps, and 13 Amps.
What is the formula for calculating power?
Power (P) is calculated using the formula P = J x V.
What is the formula for energy transfer?
Energy transfer is calculated as current x voltage x time.
What type of current does a battery provide?
A battery provides direct current (DC).
What type of current is mains electricity?
Mains electricity is alternating current (AC).
What is a closed switch?
A closed switch allows current to flow through a circuit.
What is a variable resistor?
A resistor whose resistance can be adjusted.
What is a fixed resistor?
A resistor with a constant resistance value.
What is a series circuit?
In a series circuit, the current is the same at all points.
What happens if one bulb breaks in a series circuit?
If one bulb breaks, both will break.
What is a parallel circuit?
In a parallel circuit, the current is divided among branches.
What can be controlled independently in a parallel circuit?
Devices can be controlled independently by switches.
What does an ammeter measure in a series circuit?
An ammeter measures the current flowing through the circuit.
What happens as current increases in a circuit?
As current increases, heat is generated, causing more movement of electrons.
What happens to resistance as heat increases?
Increasing heat leads to increasing resistance, which can stop the current.
What is the purpose of the organization mentioned?
To help everyone with learning for all kinds of education for over 150 years.
What is a diode?
A component that allows current to flow in one direction only.
What happens to voltage in a circuit?
Voltage increases as current increases, leading to more heat.
What is the formula for resistance?
V = IR
What is an LDR?
A Light Dependent Resistor that changes its resistance based on light levels.
Resistance decreases when it receives different amounts of light.
What is a thermistor?
A resistor that changes its resistance based on temperature.
Resistance changes when it receives different amounts of temperature.
What happens when two people collide?
When person A and person B collide, they exert forces on each other.
How do you calculate the voltage across a resistor?
Use Ohm’s Law: V = IR.
What is current in relation to electric charge?
Current refers to the flow of electric charge.
Example: Current is measured in amperes (A).
What is voltage?
Voltage is the energy transferred per charge.
Example: Voltage is measured in volts (V).
What materials can be charged by friction?
Only insulators such as glass or plastic can be charged by friction.
What happens when a negatively charged balloon comes close to a neutral object?
The balloon attracts the neutral object because the charges move away, leaving a positive charge on the object.
What is a danger of electrostatics?
Sparks from electrostatics can be dangerous, especially at petrol stations or in factories.
How can charged paint be used?
Charged paint can spread as a mist and attract to a charged car.
Example: This method is used in car painting to ensure an even coat.
