Current Electricity Practical For Necta 2026 By Mahinya Physics - senkolink.ac.tz

CURRENT ELECTRICITY PRACTICAL FOR NECTA 2026 BY MAHINYA PHYSICS

This practical guide is specially prepared for students who are preparing for the NECTA Physics Examination 2026. It focuses on the topic of Current Electricity and provides detailed explanations of practical procedures, circuit connections, observations, calculations, and data analysis techniques commonly tested in examinations.

Students will learn how to use electrical measuring instruments such as ammeters and voltmeters, verify Ohm’s Law, determine resistance, and analyze current-voltage relationships in electrical circuits. The guide also includes sample practical questions, worked examples, examination tips, and important formulas that every candidate should master before the final examination.

Current Electricity remains one of the key topics in Physics practical assessments and requires both theoretical understanding and practical skills. This material is designed to improve students’ confidence, accuracy, and performance in NECTA examinations through step-by-step explanations and practical applications.

EXAMPLE OF PRACTICAL

1. You are provided with a dry cell E, ammeter A, resistance box B, switch K and

several pieces of connecting wires.

Proceed as follows

(a) Connect a dry cell E, switch K, an ammeter A and the resistance box B in series.

(b) Using the resistance box, set the resistance R equal to 1Ω, close the K and record

the current I (A) passing through the circuit.

(c) Repeat the procedures in 3 (b) for the value of R equal to 2Ω, 4Ω, 5Ω and 6Ω.

Questions

(i) Record the results in tabular form including the values of (A⁻¹)

(ii) Draw a well labelled diagram of your circuit you connected

(iii) Plot a graph of R against

(iv) Use the graph to compute the value of E.m.f of the cell.

(v) What is the physical meaning of R- intercept?

(vi) What is the aim of doing this experiment?

 

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