Electristy And Circets Flashcards
What is the equation for power?
Power = Energy / Time
Power is often expressed in watts (W) and can also be calculated using the formula P = V × I, where V is voltage and I is current.
List some hazards of poor wiring.
- Overheating
- Short circuits
- Fire hazards
- Electric shocks
Poor wiring can lead to serious safety risks, including damage to electrical appliances and increased risk of electrical fires.
What is the formula for Ohm’s law?
V = I × R
Where V is voltage, I is current, and R is resistance.
What are the characteristics of diodes?
- Allow current to flow in one direction only
- Have a high resistance in the reverse direction
- Used for rectification in circuits
Diodes are essential components in converting alternating current (AC) to direct current (DC).
What is a parallel circuit?
A circuit where components are connected across the same voltage source
In a parallel circuit, each component has the same voltage across it, and the total current is the sum of the currents through each component.
What factors affect the resistance of a metal wire?
- Length of wire
- Thickness of wire
- Material of wire
- Temperature
Longer wires have higher resistance, while thicker wires have lower resistance.
What are the rules for voltage and current in series circuits?
- Current is the same through all components
- Voltage is divided among components
In a series circuit, the total voltage is equal to the sum of the voltages across each component.
What is the function of the yellow and green wire in a plug?
Earth (ground) wire
This wire is a safety feature that prevents electric shock by directing excess current to the ground.
State the name and/or function of each part of a plug.
- Live wire: carries current to the appliance
- Neutral wire: carries current away from the appliance
- Earth wire: safety wire that prevents electric shock
Each wire in a plug serves a specific function to ensure safe operation of electrical devices.
What is alternating current?
Current that reverses direction periodically
AC is the type of current delivered to homes and businesses, typically at a frequency of 50 or 60 Hz.
What is direct current?
Current that flows in one direction only
DC is commonly used in batteries and electronic devices.
Define current.
The flow of electric charge
Current is measured in amperes (A) and represents the rate at which charge flows through a conductor.
How do you calculate charge transferred?
Charge (Q) = Current (I) × Time (t)
Charge is measured in coulombs (C).
What does a |-V graph represent?
- Voltage (V)
- Current (I)
- Time (t)
The graph illustrates the relationship between voltage and current over time.
