flippedaroundphysics.com 2016

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Presentation transcript:

flippedaroundphysics.com 2016 Wiring a plug flippedaroundphysics.com 2016

flippedaroundphysics.com 2016 Fuse flippedaroundphysics.com 2016

flippedaroundphysics.com 2016 Objectives how do fuses work? what job do they do? how do you calculate which fuse to fit? flippedaroundphysics.com 2016

flippedaroundphysics.com 2016 The domestic plug EARTH WIRE LIVE WIRE FUSE NEUTRAL WIRE CABLE GRIP flippedaroundphysics.com 2016

flippedaroundphysics.com 2016 Anatomy of a fuse non-conducting ceramic/glass body low melting point fuse wire symbol flippedaroundphysics.com 2016

flippedaroundphysics.com 2016 Fuse - normal operation Fuse – current too high flippedaroundphysics.com 2016

flippedaroundphysics.com 2016 Normally working appliance Metal casing LIVE fuse NEUTRAL EARTH flippedaroundphysics.com 2016

flippedaroundphysics.com 2016 Appliance with a fault Metal casing LIVE fuse NEUTRAL EARTH flippedaroundphysics.com 2016

flippedaroundphysics.com 2016 Fuses come in different sizes 3A, 5A, 13A Which would you choose for a washing machine needing 11.2A to work properly? Which would you choose for a table lamp needing 1.6A to work properly? flippedaroundphysics.com 2016

flippedaroundphysics.com 2016 Choosing the correct fuse Find out the power rating of the appliance 2) Using current (A) = power/voltage calculate the current that the appliance needs (remember that mains voltage is 230V) 3) Choose a fuse that is slightly larger than the current needed flippedaroundphysics.com 2016

flippedaroundphysics.com 2016 Example A stereo system is rated at 800W. What fuse Should be fitted? Current = power/voltage = 800/230 = 3.48A Therefore a 5A fuse should be fitted flippedaroundphysics.com 2016

flippedaroundphysics.com 2016 Calculate the current needed by the following appliances and the fuse needed. Appliance Power (W) Current (A) Fuse (3A,5A,13A) kettle 2300 TV 600 iron 1200 lamp 150 cooker 1800 flippedaroundphysics.com 2016

flippedaroundphysics.com 2016 A hairdryer doesn’t have an earth wire. Can you think why not? It is made of plastic. Therefore, the casing can’t become live. flippedaroundphysics.com 2016

flippedaroundphysics.com 2016 Such appliances have this symbol. They are “double insulated” flippedaroundphysics.com 2016

flippedaroundphysics.com 2016 Circuit Breakers switch electromagnet Can you work out how they work? flippedaroundphysics.com 2016