Marine electrical · 2 min
Voltage, current, resistance
For an ideal resistor under fixed conditions, Ohm’s law connects three quantities: V = I × R.
✓Marine electrical
From a simple circuit to power on board.
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Marine electrical · 2 min
A direction, or a rhythm
DC flows in one direction; AC reverses direction periodically. The shape and frequency matter to equipment.
✓Marine electrical · 2 min
Watts are not watt-hours
Power is the rate of energy transfer. Energy accumulates over time.
✓Marine electrical · 2 min
Two numbers on the same load
In AC systems, real power in watts and apparent power in volt-amperes are different quantities.
✓Marine electrical · 2 min
Isolate the fault, preserve the rest
Protection coordination aims to clear a fault while limiting unnecessary loss of supply elsewhere.
✓Marine electrical · 2 min
An early warning in the insulation
An insulation monitoring device watches insulation resistance in an unearthed electrical system.
✓Marine electrical · 2 min
A dark screen is not proof of isolation
Equipment can have more than one supply or retain stored energy after normal operation stops.
✓Marine electrical · 2 min
Read the route of power
A simplified single-line drawing helps you see electrical supply relationships before looking at detailed wiring.
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