Apparatus for electrical method to determine specific heat capacity

Steps:

• Recall formula: specific heat capacity c = (P × t) / (m × ΔT), where P is heater power, t is time, m is mass, ΔT is temperature change.
• Measure mass m using electronic balance (1).
• Measure ΔT using thermometer (3).
• Measure time t using stopwatch (5); power P is provided as 50 W, so no additional electrical tools needed.

Why A is correct:

• Option A provides balance for mass, thermometer for ΔT, and stopwatch for time, directly enabling calculation via c = (P t) / (m ΔT) with given P.

Why the others are wrong:

• B: Voltmeter (7) measures voltage for power, but P is given; misses time measurement.
• C: Ruler (2) measures length, irrelevant; lacks mass measurement.
• D: Includes ruler (irrelevant), heater (provides P, already known), and ammeter (6, for current, unnecessary); misses mass and temperature.

Final answer: A