Get premium membership and access questions with answers, video lessons as well as revision papers.
P = V^2/R
3000 = 240^2/R
R = 240^2/3000
R = 19.2 ohms
joseph rimiru answered the question on October 10, 2017 at 20:22
- Determine the resistance of a bulb rated 100 w, 240 v.(Solved)
Determine the resistance of a bulb rated 100 w, 240 v.
Date posted: October 10, 2017. Answers (1)
- Calculate the energy dissipated in 5 minutes if an electric bulb with a filament of resistance 360 ohms is connected to 240 v mains supply.(Solved)
Calculate the energy dissipated in 5 minutes if an electric bulb with a filament of resistance 360 ohms is connected to 240 v mains supply.
Date posted: October 10, 2017. Answers (1)
- An energy saving bulb rated 10 w, 240 v was used continuously for 1000 hours. Determine the energy consumed giving your answer in kilowatt hour....(Solved)
An energy saving bulb rated 10 w, 240 v was used continuously for 1000 hours. Determine the energy consumed giving your answer in kilowatt hour. (kwh)
Date posted: October 10, 2017. Answers (1)
- In waves there is the occurrence of interference. State the necessary conditions for this to occur.(Solved)
In waves there is the occurrence of interference. State the necessary conditions for this to occur.
Date posted: October 10, 2017. Answers (1)
- On carrying out an experiment it was found that a voltmeter of high resistance was more accurate compared to that of low resistance. State the...(Solved)
On carrying out an experiment it was found that a voltmeter of high resistance was more accurate compared to that of low resistance. State the reason.
Date posted: October 10, 2017. Answers (1)
- What is Nuclear fission?(Solved)
What is Nuclear fission?
Date posted: October 10, 2017. Answers (1)
- Define Nuclide(Solved)
Define Nuclide
Date posted: October 10, 2017. Answers (1)
- Explain two dangers of electromagnetic waves.(Solved)
Explain two dangers of electromagnetic waves.
Date posted: October 10, 2017. Answers (1)
- State four Properties of electromagnetic waves(Solved)
State four Properties of electromagnetic waves
Date posted: October 10, 2017. Answers (1)
- State four applications of X-rays in industries.(Solved)
State four applications of X-rays in industries.
Date posted: October 10, 2017. Answers (1)
- State the dangers of X-rays to human body(Solved)
State the dangers of X-rays to human body.
Date posted: October 10, 2017. Answers (1)
- State types of X-rays(Solved)
State types of X-rays
Date posted: October 10, 2017. Answers (1)
- State the properties of X-rays(Solved)
State the properties of X-rays
Date posted: October 10, 2017. Answers (1)
- State one use of a CRO(Solved)
State one use of a CRO
Date posted: October 10, 2017. Answers (1)
- State four advantages of a C.R.O as a voltmeter.(Solved)
State four advantages of a C.R.O as a voltmeter.
Date posted: October 10, 2017. Answers (1)
- State four properties of cathode rays(Solved)
State four properties of cathode rays
Date posted: October 10, 2017. Answers (1)
- State four sources of mains electricity(Solved)
State four sources of mains electricity
Date posted: October 10, 2017. Answers (1)
- An electrical heater rated 240 v, 2000 w is to be connected to a 240 v mains supply through a fuse of 9.0 A. ...(Solved)
An electrical heater rated 240 v, 2000 w is to be connected to a 240 v mains supply through a fuse of 9.0 A. Will the fuse be suitable? Give a reason.
Date posted: October 9, 2017. Answers (1)
- A n electric bulb rated, 4W is operating on a 240 v mains. Determine the filament’s resistance.(Solved)
A n electric bulb rated, 4W is operating on a 240 v mains. Determine the filament’s resistance.
Date posted: October 9, 2017. Answers (1)
- A capacitor is connected to the distributor in some petrol engines which use spark plugs. What is its function?(Solved)
A capacitor is connected to the distributor in some petrol engines which use spark plugs. What is its function?
Date posted: October 9, 2017. Answers (1)