Science experiments

• Ohm’s law — Change the current, spot the pattern, and let the graph reveal resistance.
• Simple pendulum — Count the swings and turn a familiar motion into a measurement of gravity.
• Acid–base titration — Add, swirl, observe: each drop brings an unknown concentration into focus.
• Meter bridge — Move the contact until the meter rests at zero. The wire lengths hold the answer.
• Diode V–I characteristics — Reverse the connection and discover why a diode’s direction matters.
• pH and indicators — Read a colour, estimate a pH, and look for the pattern across solutions.