- An electric iron has a rating of 750 W, 220 v. calculate:
- Current passing through it; and
- Its resistance; when in use.
- An electric iron has a rating of 1000 W and 220 V. When in use calculate for it
- Current passing through it,
- Its resistance.
- An immersion heater has a rating of 2 Kw, 220 V While in use calculate
- Current passing through it, and
- Its resistance.
- An electric lamp is marked 100 W, 220 V. It is used for 2 hours daily Calculate:
- Its resistance while glowing.
- Energy consumed in KWH per day.
- An electric lamp is marked 40 W, 220V. It is used for 4 hours daily. Calculate
- Its resistance while glowing.
- Energy consumed in KWH per day.
- An electronic lamp is marked 25 W. 220V, It is used for 10 hours daily. Calculate
- Its resistance while glowing.
- Energy consumed in KWH per day.
- (i) Draw a diagram to show how two resistors R1 and R2 are connected in series.
(ii) In a
circuit of two resistors 5 ohm and 10 ohm are connected in series, how does the
current passing through the two resistors compare?
- A bulb is rated at 5.0 volt, 100 ma. Calculate its
·
Power and
·
Resistance.
- An electric heater is used everyday for 120 minutes. The electricity bill for 30 days is 60 units. Calculate the power of the electric heater.
- Name the unit used in selling electrical energy to consumers. Two lamps , one rates 100 W at 220 V and the other 40 W at 220V are connected in parallel to a 220V main supply line.
- In a household 5 tube lights of 40 W each are used for 5 hours and an electric press of 500 W for 4 hours everyday. Calculate the total electrical energy consumed by the tube lights and press in a month of 0 days.
- A torch bulb is rated 2.5 v and 750 ma. Calculate
·
Its power
·
Its resistance
·
The energy consumed if this
bulb is lighted for 4 hours.
- Two electric lamps of 100 W and 25 W respectively are connected in parallel to a supply voltage of 200 V. Calculate the total current flowing through the circuit.
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