Consider three different approaches, shown in Fig. 1, to measure power dissipation in a resistor with tolerance of 3%. Calculate the overall uncertainties $\frac{\Delta P}{P}$ in the measurement of power for all three methods, when it is assumed that the accuracy of the meter is 3% of the reading.
Fig. 1 Different measurement approaches to measure power dissipation in a resistor. a) using ammeter $P = I^2R$, b) using voltmeter $P = \frac{U^2}{R}$ and c) using both ammeter and voltmeter $P = UI$.
First consider case a) when ammeter is used. Give answer in percentage form (e.g. 1.1 means 1.1 percent)!
b) When voltmeter is used, if resistor tolerance is 7.3%.
