Estimate the design-stage uncertainty in determining the voltage drop across an electric heating element. the device has a nominal resistance of 30 ? and power rating of 500 w. available is an ohm meter (accuracy: within 0.5%; resolution: 1 ? ) and ammeter (accuracy: within 0.1 % ; resolution: 100 ma). recall e=ir hint: e=ir or in terms of power, p=pr