Presentation ~ above theme: "Electric Power. Price Me!!! just how is the brightness that a light pear measured? What do you think is the significance of this?"— Presentation transcript:
You are watching: A toaster dissipates 1500 watts of power
1 electrical Power
2 price Me!!! just how is the brightness that a light pear measured? What perform you think is the definition of this?
3 electric Power power is the rate at which job-related is done or energy is expended. Electrical Power is the price at which electric energy is expended.
4 electrical Power electrical power is the product of electrical current and also potential distinction P = V·I strength is tho measured in Watts:
5 electrical Power and also Ohm’s legislation
6 electric Energy since work is define by: electric energy is measure up in Joules. Power is a scalar quantity.
7 Practice problem 1 A microwave stove operating at 120 V is used to warmth a hot dog. If the oven draws 12.5 A of current for 45 seconds, what is the power dissipated by the oven?
8 Practice difficulty 2 If the potential drop across an operation 300 W floodlight is 120 V, what is the current through the floodlight?
9 Practice problem 3 A potential fall of 50 V is measured throughout a 250 ohm resistor. What is the power developed in the resistor?
10 Practice problem 4 together the potential difference throughout a offered resistor is increased, the strength expended in moving the charge v the resistor will certainly _____________.
11 Practice trouble 5 A toaster dissipates 1500 W of power in 90 seconds. What is the lot of electrical energy offered by the toaster?
12 Practice problem 6 An electrical iron operation at 120 V draws 10 A the current. How much heat power is ceded by the steel in 30 seconds?
13 Practice trouble 7 An electrical dryer spend 6.0 x 10 6 J of power when operating at 220 V because that 30 minutes.
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Throughout operation, the dryer draws exactly how much current?
14 Practice problem 8 one operating electrical heater color etc a present of 10 A and also has a resistance of 12 ohms. Exactly how much energy does the heater usage in 60 seconds?