# Finding resistance/Power Consumption

1. Dec 5, 2006

### glasgowm

An electric cooker has two settings, high and low. It takes 1A at the low setting and 3A at the high setting (It lists 230 as the voltage on the diagram)

Find the resistance of R1 & R2 (they are parallel circuits)

V=IR (R= V/I)

high setting: R=V/I ... R = 230V/3A = 76.6667Ω
low setting: R=V/I ... R = 230V/1A = 230Ω

I figure I'm doing something wrong since the answers I come out with a bit weird

Part 2

Calculate the power consumption

P = I²R

P = 1²A*230 | P = 3²A*76.6

Last edited: Dec 5, 2006
2. Dec 5, 2006

### Staff: Mentor

Looks good to me.

Also good. But complete the calculation and assign proper units.

(Power consumption can also be calculated using P = VI.)