{"id":22,"date":"2014-10-17T07:17:34","date_gmt":"2014-10-17T07:17:34","guid":{"rendered":"http:\/\/blogs.glowscotland.org.uk\/gc\/hyndsecphysu2hwrk\/?page_id=22"},"modified":"2014-10-17T07:17:34","modified_gmt":"2014-10-17T07:17:34","slug":"electricity-energy-exercise-3","status":"publish","type":"page","link":"https:\/\/blogs.glowscotland.org.uk\/gc\/hyndsecphysu2hwrk\/electricity-energy-exercise-3\/","title":{"rendered":"Electricity & Energy Exercise 3"},"content":{"rendered":"

1.\tCopy and complete this table.
\n\"\"<\/a>
\n2.\tWhat is the resistance of a lamp that allows 600 mA of current to flow through it when there is a potential difference of 12 V across it?\t \t\t<\/p>\n

3.\tWhat is the current flowing through a piece of 10 k\u03a9 resistance wire when there is a voltage of 15 V is across <\/p>\n

4.\tWhat is the voltage across a 125 \u03a9 lamp that has a current of 1.84 A flowing through it?<\/p>\n

5.\tWhat is the purpose of a resistor in a circuit?\t\t\t \t\t<\/p>\n

6.\tWhat is the difference between a fixed-value resistor and a variable resistor?<\/p>\n

7.\tA variable resistor can be used to control the speed of the electric motor in a portable fan. The variable resistor has a range of values from 300 \u2126 to 1.5 k\u2126. Assume that the motor has no resistance.
\n\"\"<\/a><\/p>\n

(a)\tWhat is the maximum current that can flow through the motor? \t\t <\/p>\n

(b)\tWhat is the minimum current that can flow through the motor?\t\t\t\t <\/p>\n

8.\tA variable resistor is used as a dimmer switch in a lighting circuit.
\n\"\"<\/a><\/p>\n

(a)\tWhat is the resistance of the variable resistor if the current flowing through the variable resistor is 0.20 A and the voltage across it is 4 V?<\/p>\n

(b)\tWhat is the resistance of the variable resistor when the current flowing through the lamp is 5 mA and the voltage across the lamp is 2 V? \t\t<\/p>\n","protected":false},"excerpt":{"rendered":"

1. Copy and complete this table. 2. What is the resistance of a lamp that allows 600 mA of current to flow through it when there is a potential difference of 12 V across it? 3. What is the current flowing through a piece of 10 k\u03a9 resistance wire when there is a voltage of … Continue reading Electricity & Energy Exercise 3<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":2454,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"open","ping_status":"open","template":"","meta":{"footnotes":""},"class_list":["post-22","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/blogs.glowscotland.org.uk\/gc\/hyndsecphysu2hwrk\/wp-json\/wp\/v2\/pages\/22","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blogs.glowscotland.org.uk\/gc\/hyndsecphysu2hwrk\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/blogs.glowscotland.org.uk\/gc\/hyndsecphysu2hwrk\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/blogs.glowscotland.org.uk\/gc\/hyndsecphysu2hwrk\/wp-json\/wp\/v2\/users\/2454"}],"replies":[{"embeddable":true,"href":"https:\/\/blogs.glowscotland.org.uk\/gc\/hyndsecphysu2hwrk\/wp-json\/wp\/v2\/comments?post=22"}],"version-history":[{"count":1,"href":"https:\/\/blogs.glowscotland.org.uk\/gc\/hyndsecphysu2hwrk\/wp-json\/wp\/v2\/pages\/22\/revisions"}],"predecessor-version":[{"id":26,"href":"https:\/\/blogs.glowscotland.org.uk\/gc\/hyndsecphysu2hwrk\/wp-json\/wp\/v2\/pages\/22\/revisions\/26"}],"wp:attachment":[{"href":"https:\/\/blogs.glowscotland.org.uk\/gc\/hyndsecphysu2hwrk\/wp-json\/wp\/v2\/media?parent=22"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}