An electric appliance with a current of I and a resistance of R is used for t hours during the course of a month. The cost of operating the appliance at 120-Volts is D dollars. What would be the new cost (in terms of D) if ... a. ... the usage rate was doubled to 2t? b. ... the usage rate was halved? c. ... an appliance which drew twice the current (at 120 Volts) were used? d. ... an appliance with twice the resistance (at 120 Volts) were used? e. ... an appliance with one-half the resistance (at 120 Volts) were used? f. ... the usage rate was doubled and an appliance with twice the resistance (at 120 Volts) were used? g. ... the usage rate was halved and an appliance with twice the current (at 120 Volts) were used? h. ... the usage rate was quartered and an appliance with twice the current (at 120 Volts) were used?

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