Which level of electric current flowing through the human body is generally considered the threshold where ventricular fibrillation (fatal heart disruption) can occur?
Electrical Safety
Question · Medium
100 metronomes and 1 rescuer
Short
What is the very first action you should take when you find a person receiving an electric shock in a workshop?
Question · Easy
In electrical safety and lock-out tag-out (LOTO) procedures, what does the term 'double isolation' refer to?
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Which type of fire extinguisher is specifically designated and safe for extinguishing electrical fires?
What is the primary safety purpose of wearing arc-rated personal protective equipment (PPE) when working on live switchboards?
Same battery. Which lets more through?
When administering CPR to an adult electrical shock victim, what is the correct depth and rate of chest compressions?
What is the maximum nominal AC voltage limit considered as 'Extra-Low Voltage' (ELV) in dry conditions, below which the risk of fatal electric shock is minimal?
What is the correct immediate first aid treatment for a technician who has sustained minor electrical burns on their forearm?
What is the main purpose of a 'Permit-to-Work' (PTW) system in industrial electrical installations?
What is the safest practice when using a ladder to work near overhead electrical power service lines?
What physical phenomenon causes an 'arc flash' during a short circuit on a high-energy electrical switchboard?
Question · Hard
What does an safety sign displaying a yellow triangle with a black lightning bolt symbol indicate?
Which tool is the ONLY approved device to verify that an electrical circuit is dead before beginning work?
Tools And Instruments
Which electrical instrument is specifically designed to measure the high resistance of insulation on cables and motor windings?
Which workshop tool is used to cut external threads onto the ends of heavy-gauge steel conduits during installation?
When installing PVC conduit, what tool is inserted inside the conduit to prevent it from buckling or collapsing while making a cold bend?
What is the primary function of an electrician's draw tape (also known as a fish tape)?
Which symbol on a portable power tool nameplate indicates that the tool is 'double-insulated' and does not require an earth connection for safety?
Which type of instrument is required to measure the very low electrical resistance of protective bonding conductors to ensure effective grounding?
What is the consequence of nicking or scratching a copper wire conductor when stripping its insulation?
What electrical parameter is a clamp-on ammeter (clamp meter) primarily designed to measure without physically disconnecting the circuit?
What must you do if the internal fuse of a digital multimeter blows while you are testing a circuit?
Which testing method is used by an earth resistance tester to measure the resistance of a driven earth electrode?
Which tool is standard for ensuring that surface-mounted conduit runs and distribution boards are installed perfectly horizontal and vertical?
According to Ohm's Law, what is the formula to calculate Voltage (V) when Current (I) and Resistance (R) are known?
Electrical Principles
What is the total resistance of three 12-ohm resistors connected in parallel?
What is the total resistance of three 12-ohm resistors connected in series?
Calculate the power consumed by a 240 V domestic water heater that has an internal element resistance of 24 ohms.
How is the frequency of an alternating current (AC) system defined?
What is the standard frequency of the public electricity AC supply grid in Ghana?
What is the nominal single-phase voltage supplied to domestic consumers in Ghana?
What is the nominal three-phase line-to-line voltage supplied to industrial consumers in Ghana?
What is the primary unit of measurement for electrical energy consumed over time, as displayed on domestic utility meters in Ghana?
What mathematical relationship links the frequency (f) of an AC signal to its periodic time (T)?
What physical force acts as the pressure that pushes free electrons through an electrical conductor?
What property of an inductive coil causes it to oppose any changes in the electric current flowing through it?
Which electrical device uses electromagnetic induction to transfer electrical energy between two isolated circuits at different voltage levels?
What is the formula for calculating active electrical power (P) in a single-phase AC circuit containing resistive and reactive loads?
What does the 'power factor' represent in an alternating current (AC) distribution system?
Why is high-conductivity copper the most widely used material for electrical wiring conductors in building installations?
What happens to the electrical resistance of a copper conductor as its temperature rises?
Calculate the current drawn by a 1.2 kW single-phase resistive appliance connected to a 240 V AC supply.
What is the standard copper conductor cross-sectional area recommended for domestic lighting sub-circuits in Ghana?
Wiring Methods And Installation
What is the standard copper conductor cross-sectional area used for domestic socket outlet ring or radial circuits in Ghana?
Which copper cable size is recommended for wiring domestic electric cooker control units in Ghana?
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