ElectAltEngOnl.19-20.SEC - Theodore Neitzel 1 of 3
Dada:
+
Automatic Zoom
D. The strength of an electric field.
Use the following scenario to answer question 2.
Some students took a study break and played Guitar Hero on their PlayStation. They used a TV
requiring 1.75 amps and a PlayStation requiring 0.75 amps. Assume electricity costs $0.15 per
kWh and they used 120V outlets.
2. What is the resistance of the TV?
A. 68.6 amps
B. 210 amps
C. 68.6 ohms
D. 210 ohms

Option C is correct.

The resistance of the TV = 68.6 ohms.

Explanation:

According to Ohm's law, the voltage across a device is equal to the product of the current through the device and the resistance across the device.

Since electrical appliances are setup in parallel connection, the voltage across the TV and the PlayStation is the same and is 120 V.

V = IR (From Ohm's law)

V = voltage across the TV = 120 V

I = current flowing through the TV = 1.75 A

R = Resistance of the TV = ?

120 = 1.75 × R

R = (120/1.75) = 68.57 ohms = 68.6 ohms.

Hope this Helps!!!

5 w for 1hr = 5x60x60 joules=300x60=3000x6=18,000j as total energy conversion. efficiency of bulb needed for radiant to thermal within 18000