# Physic

These three are connected to 240V main supply :
Grill = 6A
Desk lamp = 0.6A
Convector heater = 4.5
a(ii) which of these has the greatest resistance ? Explain how you can tell.
(ii) calculate the resistance of the grill
(iii) calculate the power rating of the convector heater
(b) the plug fitted to the convector heater has three wires : live,neutral,earth.
(i) which wire in the plug has no current passes in normal circumstances. Explain the safety of this wire.
(ii) why is it important that the wire connecting the heater to the main supply have a low resistance?

1. 👍 0
2. 👎 0
3. 👁 91
1. Someone will be happy to critique your thoughts. The three apliances are wired in parallel to the 240 V supply. Because of Ohm's Law, current is inversely proportional to resistance.

Take it from there.

The subject is physics, not physic. A physic is a laxative.

1. 👍 0
2. 👎 0
posted by drwls

## Similar Questions

1. ### Physics - Assist pls!

When a certain a.c. supply is connected to a lamp, it lights with the same brightness as it does with a 12V battery a) what is the r.m.s. value of the a.c. supply? b) what is the peak p.d. of the a.c. supply? Isn't rms value the

asked by Sola on April 17, 2007

The demand for desk lamp is linear,and the price of desk is \$30.the demand curve for desk lamp then shifts out parallel to itself in response to increase in consumer income.prove that the demand for desk lamps become less price

asked by Nan on August 27, 2017
3. ### CIRCUITS

two resistors of 25 ohms and 5 ohms respectively are connected in series to a 240V supply calculate the value of a third resistor to be connected in parallel with 25 ohms resistor so that the power dissipated shall be tripled

asked by Kirchhoffs on September 25, 2017
4. ### Supply and Demand

50) the monthly demand and supply functions for the Luminar desk lamp are given by p=d(x)= -1.1x^2 + 1.5x + 40 p= s(x)= 0.1x^2 + 0.5x + 15 respectively, where p is measured in dollars and x in units of a thousand. Find the

asked by Steff on June 6, 2011
5. ### physics 102

three lamps connected to a 120-V AC (rms) household supply voltage. Lamps 1 and 2 have 75.0-W bulbs; lamp 3 has a 40.0-W bulb. (a) For each bulb, find the rms current. Irms, lamp 1 = A Irms, lamp 2 = A Irms, lamp 3 = A (b) For

asked by Matt Will on August 9, 2012
6. ### Physics

A 100 W lamp is connected to 120 V, and its current is measured. A resistor is added to the lamp to reduce the current to half its original value. (a) What is the potential difference across the lamp? (b) How much resistance was

asked by Billy on April 14, 2013
7. ### English

1. The fluorescent lamp is over the desk. 2. An ant is beneath the table. 3. The cat is under the table. 4. A book is on the table. ----------------------- Does #1 mean that the fluorescent lamp is right above the table? If the

asked by rfvv on November 26, 2016
8. ### Algebra II

The intensity of illumination at a given point is directly proportional to the intensity of the light source and inversely proportional to the square of the distance from the light source. If a desk is properly illuminated by a

asked by Marie on November 22, 2011
9. ### Algebra II

The intensity of illumination at a given point is directly proportional to the intensity of the light source and inversely proportional to the square of the distance from the light source. If a desk is properly illuminated by a

asked by Zach on November 21, 2011
10. ### Algebra II

The intensity of illumination at a given point is directly proportional to the intensity of the light source and inversely proportional to the square of the distance from the light source. If a desk is properly illuminated by a

asked by Ashley on November 22, 2011

More Similar Questions