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Dangers of Electricity 1 MS

The document discusses safety issues related to electricity and provides examples of correct wiring configurations for heaters. It addresses hazards like shock from damp switches and how to reduce risk. It also examines earthing aircraft to discharge static charge safely and describes the components of electricity like potential difference and frequency.

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Karim Sellami
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62 views2 pages

Dangers of Electricity 1 MS

The document discusses safety issues related to electricity and provides examples of correct wiring configurations for heaters. It addresses hazards like shock from damp switches and how to reduce risk. It also examines earthing aircraft to discharge static charge safely and describes the components of electricity like potential difference and frequency.

Uploaded by

Karim Sellami
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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1 (a output of A: 1, 1, 0, 0 c.a.o.

[1]
output of B: 0, 1, 0, 0 e.c.f. from candidate’s output of A [1]

(b) dark AND hot owtte


note: must be consistent with answer to (a) [1]

(c) B cannot provide enough power / current for lamp, or equivalent


OR allows remote lamp [2]
note: statement of function of a relay without reference to context gains 1 mark

PhysicsAndMathsTutor.com
2 (a (i) current/electricity could flow through/across switch due to dampness / humidity

OR water (good) conductor B1

danger of shock/electrocution B1

accept alternative:
short (circuit) (B1)
(danger because) lights go out when fuse blows (B1)
[2]

(ii) pull switch with long cord of insulating material


OR normal switch outside workroom
OR switch with non-contact operation / insulating cover / sensor actuation B1 [1]

(b)
b) friction with hose M1

reasoning relating to charge moved to / from aircraft OR to / from hose


OR rubber insulates A1 [2]

(ii) (water conducts) charge to / from aircraft OR away / to ground OR through


tyres / wheels
OR earthing o.w.t.t.e. B1 [1]

[Total: 6]

3 (a)
a) ( potential difference OR e.m.f. OR voltage ignore volts

(ii) frequency accept cycles/s ignore waves/s all 3 B1

(iii) power accept energy/s

(b)
b) case/frame/outside/base/parts that can be touched ignore metal parts B1

(ii) electric shock/electrocution/death by electricity o.w.t.t.e. ignore anything else B1


live wire touches case B1

(c) heaters in parallel with any supply


(M0 if no supply, clear break in circuit, short across supply or heater) M1
one switch controlling both heaters and one switch controlling one heater
OR one switch in series with each element A1

special case: heaters in series with supply and one switch shorting out one
resistor AND another switch in series with supply B2 [6]

PhysicsAndMathsTutor.com

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