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A propeller on an electric motor above an electronic balance sends air onto its pan, as in Fig. 4.1. The motor is driven by a variable 0–12 V d.c. supply. Plan an investigation of how the force of air from the propeller on the electronic balance varies with power-supply voltage. Use Fig. 4.1. Explain the procedure and controlled variables; draw an empty results table with headed units; explain how readings lead to a conclusion.
A propeller on an electric motor above an electronic balance sends air onto its pan, as in Fig. 4.1. The motor is driven by a variable 0–12 V d.c. supply.
Plan an investigation of how the force of air from the propeller on the electronic balance varies with power-supply voltage. Use Fig. 4.1. Explain the procedure and controlled variables; draw an empty results table with headed units; explain how readings lead to a conclusion.