Current Electricity: JAMB Physics Questions, Answers & Notes

What Current Electricity covers in the JAMB Physics syllabus

Electric current is the rate of flow of charge (I = Q/t), measured in amperes. Ohm's law: at constant temperature V = IR. Resistance (ohms) increases with a conductor's length and temperature and decreases with greater cross-sectional area; resistivity is the material's own property. Resistors in series add (R = R₁ + R₂ + …); in parallel they combine by 1/R = 1/R₁ + 1/R₂ (total less than the smallest). An ammeter (measuring current) goes in series; a voltmeter (measuring potential difference) goes in parallel. A rheostat varies the current.

For Current Electricity, JAMB expects you to be able to:

• Define current and apply Ohm's law V = IR
• Combine resistors in series and parallel
• Use ammeters/voltmeters correctly and explain factors affecting resistance

Key facts & revision notes: Current Electricity

These are the recurring points our Current Electricity questions test — revise them until each feels automatic, then practise the questions above to lock them in.

• Electric current is the rate of flow of electric charge, I = Q/t.
• Current is measured in amperes (A).
• Ohm's law: I ∝ V at constant temperature, so V = IR.
• Ohm's law: V = IR (voltage = current × resistance).
• Resistance is measured in ohms (Ω).
• In series, R_total = R₁ + R₂ + …
• In parallel: 1/R = 1/R₁ + 1/R₂ (total less than the smallest).
• 1/R = 1/6 + 1/6 = 2/6, so R = 3 Ω.
• An ammeter is connected in series so the full current passes through it.
• A voltmeter is connected in parallel (across) the component.
• Resistance increases with length (R ∝ L) and decreases with greater area (R ∝ 1/A).
• For metals, resistance increases with temperature.
• A rheostat is a variable resistor used to control the current.
• Copper is an excellent conductor; rubber, glass and wood are insulators.
• 1/R = 1/2 + 1/2 + 1/2 = 3/2, so R = 2/3 ≈ 0.67 Ω.
• Resistivity is a characteristic property of the material itself, independent of its size or shape.
• An ammeter measures current.
• V ∝ I gives a straight line through the origin.
• The ohm's symbol is the Greek letter omega, Ω.
• In series, resistances add: 4 + 8 = 12 Ω.
• (4×4)/(4+4) = 16/8 = 2 Ω.
• Low resistance keeps it from altering the current it measures.
• High resistance draws almost no current from the circuit.
• A smaller cross-section raises resistance.

Worked examples

Three Current Electricity questions with the answer and a short explanation, so you can see how the topic is set before you practise the full set.

How Current Electricity is tested in JAMB Physics

Our Current Electricity bank holds 40 questions (8 easy, 26 medium, 6 hard). JAMB Physics typically returns to Current Electricity year after year, so steady practice on this topic is high-value revision. Questions are multiple-choice with four options, and at UTME pace you get roughly 40 seconds each — which is why timed practice matters.

How to answer Current Electricity questions

Work the stem first and predict the answer before you look at the options; then eliminate the ones that contradict the key facts above. Watch for “which is not…”, “all of the above” and “except” style stems, which are where rushed candidates lose easy marks on Current Electricity. If a calculation or a precise definition is involved, work it from first principles rather than guessing from a half-remembered rule. When two options look right, re-read the stem for the qualifier that separates them — JAMB rarely repeats an option by accident. If you are still unsure, eliminate the two weakest choices to lift your odds, flag the question, and move on; never burn a full minute on one Physics item when the exam gives you about forty seconds each. Then come back to flagged questions with whatever time remains. The single most reliable way to get faster at Current Electricity is repeated timed practice, so use the button above until the recurring patterns feel automatic.

Common mistakes to avoid in Current Electricity

The errors that cost marks on Current Electricity are usually careless rather than conceptual: misreading a negative stem, confusing two similar terms, or rushing a definition you actually know. Candidates also over-rely on “expo” and last-minute cramming instead of understanding the topic — which fails the moment JAMB rephrases a familiar idea. Treat every option as a claim to be checked against the facts above, keep your working tidy for any calculation, and don’t change a considered answer on a hunch. Above all, revise Current Electricity actively by answering questions, not just by re-reading notes — recall under time is what the exam rewards.

Frequently asked questions

Is Current Electricity part of the JAMB Physics syllabus?

Yes. Current Electricity is a recognised topic in the JAMB Physics syllabus, covering define current and apply Ohm's law V = IR. You should be able to recall its key facts and apply them to multiple-choice questions.

How many Current Electricity questions can I practise on Belmadeng?

There are 40 original, JAMB-standard Current Electricity questions in our free bank, each with the correct answer and a worked explanation. You can practise them untimed or as a timed test.

What are the most important points to know about Current Electricity?

Electric current is the rate of flow of charge (I = Q/t), measured in amperes. Ohm's law: at constant temperature V = IR. Resistance (ohms) increases with a conductor's length and temperature and decreases with greater cross-sectional area; resistivity is the material's own property. Resistors in se…

How do I answer Current Electricity questions quickly in JAMB?

Read the stem carefully, eliminate clearly wrong options, and match the remaining choices to the key facts for Current Electricity. Practising timed Current Electricity questions builds the speed you need for UTME's pace of about 40 seconds per question.

Are these JAMB Physics Current Electricity questions past questions or original?

They are original questions written to JAMB (UTME) standard and mapped to the official syllabus — not reproduced past papers. This keeps them legal to use freely while closely mirroring how the real exam tests the topic.

Where can I practise Current Electricity questions free without signing up?

Right here — tap “Start Current Electricity practice” on this page to begin instantly. Belmadeng's CBT practice is completely free and needs no sign-up, download or subscription.

About these questions: original, JAMB-standard items written from the official UTME Physics syllabus (last reviewed 2026-09-18). Belmadeng is an independent study platform and is not affiliated with JAMB. Spotted an error? Use the report link.