Curriculum
Course: IB Physics HL
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Curriculum

IB Physics HL

Theme A — Space, Time and Motion

0/125 Dr Dabour Hub Science Diagram and Course Material

Theme B — The Particulate Nature of Matter

0/105 Dr Dabour Hub Science Diagram and Course Material

Theme C — Wave Behaviour

0/73 Dr Dabour Hub Science Diagram and Course Material

Theme D — Fields

0/77 Dr Dabour Hub Science Diagram and Course Material

Theme E — Nuclear and Quantum Physics

0/89 Dr Dabour Hub Science Diagram and Course Material

Tools and Inquiry — IB Physics skills

0/43 Dr Dabour Hub Science Diagram and Course Material
Quiz

B.5.9 Electrical Power – Check yourself

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  • Questions count: 6
  • Passing grade: B+
  • Time limit: 10 minutes
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1.
Which expression does NOT give electrical power in a resistor?
VI
I2R
IR2
V2/R
2.
A resistor of 50 Ω carries 0.40 A. The power is
20 W
8.0 W
125 W
0.080 W
3.
The p.d. across a fixed resistor is tripled. The power becomes
3 times
9 times
6 times
27 times
4.
One kilowatt-hour equals
3.6 MJ
3.6 kJ
60 kJ
360 MJ
5.
Two resistors of 2 Ω and 8 Ω are in parallel across a supply. Which dissipates more power?
The 8 Ω, because it is larger
They dissipate equal power
Neither, because current is the same
The 2 Ω, because it is smaller
6.
A 100 W lamp is on for 5.0 hours. The energy used in kWh is
500
20
0.50
5.0
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Part of Theme B — The Particulate Nature of Matter — see every lesson and quiz in this unit.
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