Electrical Systems & Circuits
Trace the path first. Then decide what happens to current, voltage, resistance, and bulb behavior when a circuit changes.
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Trace the complete conducting path
Current needs a complete conducting path.
One path; the same current passes through each series component.
Separate branches provide separate paths.
Potential difference drives charge through a circuit.
At fixed voltage, greater resistance means smaller current: I = V/R.
Retrace which complete paths remain after the failure.
PATH → BRANCH → CHANGE
PATH: is the loop complete? BRANCH: is the component on the only path or one of several paths? CHANGE: after a switch, bulb, or resistor changes, retrace the remaining circuit.
Five circuit relationships
Open switch: breaking the only path stops current in that loop.
Series bulbs: identical bulbs in one path carry the same current.
Parallel bulbs: opening one branch need not stop another intact branch.
Ohm's law: at fixed voltage, doubling resistance halves current.
Failure tracing: never assume one broken bulb turns everything off; inspect the topology first.
Common traps
Current is not “used up” by the first series component. A battery supplies potential difference, not a fixed current for every circuit. Parallel branches are not the same as extra components in series. For failure questions, redraw the remaining conducting paths.
Can you transfer the idea across five forms?
This diagnoses your next practice step; it does not verify mastery.
Practice at the level you need
Verify the competency
Mastery requires 5/5. An unsuccessful attempt loads a different set.
Quick clarifications
Does current get used up by the first bulb?
No. In a steady series loop, the same current passes through each component.
If one bulb fails, do all bulbs always go out?
No. It depends on whether the failure breaks the only path or just one parallel branch.
Why is this Mechanical Reasoning?
DOST's own Mechanical Reasoning description explicitly includes electrical problems.
Mechanical Reasoning sequence complete
Gears & Gear Trains · Belts, Chains, Racks & Connected Wheels · Levers, Torque & Balance · Pulleys & Mechanical Advantage · Wheels, Axles & Rotational Systems · Forces, Friction & Equilibrium · Motion, Energy & Mechanical Relationships · Fluids, Pressure & Hydraulic Systems · Heat, Sound & Everyday Physical Effects · Electrical Systems & Circuits
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