Electrical Flashcards
What is reactance ?
It opposes the change in current and causes the current to be out of phase with the voltage.
List 2 types of reactance
How does capacitive reactance work ? ( DC )
- Current rush out when first closed
- Current build up , starts to oppose/ impede the force (Voltage)
- leading current
What happens to capacitive reactance in low and high frequency ?
- low frequency - capacitors have time to charge - push back more - more reactance
- high frequency - no time to charge - less reactance
What is the capacitive reactance formula ?
What happens in inductive reactance ? (DC)
- when circuit is closed, inductor starts to create a magnetic field.
- the magnetic field doest want to change so oppose
- eventually it’s overcome by the voltage, magnetic field forms, current flow easily
What happens to inductive reactance in low and high frequencies ?
- low frequency - lower reactance
- high frequency - higher reactance
What is the formula for inductive reactance ?
What is the phase angle for capacitive reactance ?
- -90° phase angle
- bcz when circuit close, current rush out
What is the phase angle for capacitive reactance ?
- -90° phase angle
- bcz when circuit close, current rush out
What is the impedance formula in a series circuit ?
Phase angle can be found using the …. ?
Impedance triangle
What is Hazchem code ?
Name the following dangerous goods.
What is SDS ?
- A Safety Data Sheet (SDS) is an informative document detailing the safety information for a given material.
- Contains ff sections
Identification of Substance / Preparation / Company
Composition / Information on Ingredients
Hazard Identification
First Aid Measures
Firefighting Measures
Accidental Release Measures
Handling and Storage
Exposure Controls / Personal Protection
Physical and Chemical Properties
Stability and Reactivity
Toxicology Information
Ecological Information
Disposal Considerations
Transport Information
Regulatory Information
What is the recommended ratio for using an extension ladder ?
- 4:1
What are the first aid procedures ?
Define Hazard, Risk and Control measures.
- Risk is the likelihood of the hazard causing harm and the severity of the potential harm.
List the ff workplace safety signs.
What are the required mounting heights for fire extinguishers ?
State the procedure for using a portable fire extinguisher.
PASS acronym
Pull out the safety pin
Aim the nozzle at the base of the fire
Squeeze the trigger
Sweep from side to side
Fill in the blanks
