Potential difference V = W/q: work per unit charge. Electric field E = F/q: force per unit charge. Memory tip: 'Potential = work/charge (scalar); Field = force/charge (vector)'. Electrostatics definition frequently tested in competitive exams.
Explanation:
Ammeter measures current. Galvanometer detects presence and direction of small currents, can be calibrated as ammeter/voltmeter. Voltmeter measures voltage. Potentiometer measures emf precisely.
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