Table of Contents
Title Page1
Introduction3
Research Questions4
Questions4
Answers4
Experiment6

Introduction

This experiment is carried out to show how the

Research Questions

Questions

1) Provide the units used to measure the following quantities, electric current, inductance, frequency, power and energy (work).

2) What is the difference between AC and DC voltages? Give examples.

3) Provided a household has:
* 10 light bulbs of 60 watts each (used 6h/day on average) * TV using 100 watts (used 4h/day on average)
* A washing machine using 1000 watts (used for 3 /h once every 3 days) Calculate the total average energy consumption of this household in a quarter (90 days) in joules than in Kilowatt hours (kWh).

4) If the energy consumption is charged at 20p/kWh, what is the cost of the electricity bill for that quarter?

Answers

1) The following quantities are measured in the following units; - Electric Current is measured in Ampere, A.
- Inductance is measured in Henry, H.
- Frequency is measured in Hertz, Hz.
- Power is measured in Watts, W.
- Energy (work) is measured in Joules, J.

2) AC

3) Power = Energy / Time, therefore Energy = Power x Time. i) 10 bulbs x 60 Watts = 600 Watts, 600 Watts x 6 Hours = 3600 Wh = 3.6 kWh per day. ii) 100 Watts x 4 Hours = 400 Watts = 0.4 kWh per day.

iii) 1000 Watts x 3 Hours = 3000 Wh every 3 days = 1 kWh per day. iv) 1 kWh + 0.4 kWh + 3.6 kWh = 5 kWh per day.
v) 5 kWh x 90 Days = 450 kWh per quarter (90 days).
vi) Using 1 Joule/sec = 1 watt, 1 Joule = 1 Watt x sec, 1k/w = 1000 Watts & 3600 sec in 1 Hour; 450 kWh x 3600 x 1000 = 1620000000 = 1.62 x 10^9 Joules.

4) If electricity bill is 20p/kWh then 450 x 20p = £90.00 for the quarter.

...wire has much more resistance. Energy has to be spent to force electrons through it. And heat comes off as a result.
All conductors have some resistance but:
 Long wires have more resistance than the short wires.
 Thin wires have more resistance than thick wires.
 Nichrome wire has more resistance than copper wire of the same size.
Resistance is calculated using this...

...Physics GCSE coursework: Resistance of wire
Aim: To investigate if the length of wire affects its resistance.
Prediction (Hypothesis):
I predict that the longer the wire the higher the resistance, and the shorter the wire the lower the resistance.
Knowledge:
Resistance is that property of electric components that turn electric energy into heat in opposing the passing of an electric current.It can be...

...can measure resistance, voltage, and continuity; while more advanced versions may be able to provide additional data. This tool can be very useful to have around the house, and anyone who plans on doing electrical repairs should most definitely use a multitester for safety reasons. Multitesters can be used with the current off or on in most cases, although using the device with the current on can sometimes result in damage to the device.
Theory
Ammeters are employed for...

...scale divisions which can be read to half a division. Determine resolution of meter
in volt. [0.25 V]
(c) A Wheatstone bridge is balanced with all the four resistances equal to 1kΩ each. The bridge supply voltage is
100V. Now one of the resistances is changed to 1010Ω. The output voltage is measured by a voltmeter of infinite
resistance. Calculate the bridge sensitivity. [25V or 0.025 V/Ω]
(d)Each of the following numbers has a uncertainty of one...

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c h a p t e r
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Resistance
No pain, no palm; no thorns, no throne; no gall, no glory; no cross,
no crown.
—William Penn
Historical Proﬁles
Georg Simon Ohm (1787–1854), a German physicist, in 1826
experimentally determined the most basic law relating voltage and current for a resistor. Ohm’s work was initially denied by critics.
Born of humble beginnings in Erlangen, Bavaria, Ohm threw himself into...

...ELECTRICITY HOTS Questions for Practice 1. Name a substance whose resistance almost remains unchanged by increase of temperature. 2. Name two special characteristics of heater coil. 3. A wire of resistance 4 ohms is bent to form a circle. What is the resistance between two diametrically opposite ends? 4. How does the resistance of a conductor change if its temperature is increased? 5. A current of 4A flows in a wire of...

...Batteries, Resistance and Current
“Battery-Resistor”:
Check “show battery” and “show cores”, watch what happens, adjust some variables
1. Why do electrons (blue dots) move? Draw a diagram of the battery, label the flow of electrons. The flow of current (+) is opposite; draw this and note if toward or away from + terminal of the battery.
The blue dots indicating the electrons move because there is a voltage across the battery in which the electrons flow away from...

...Resistance coursework
Aim: My aim is to find out which factors affect the resistance of wire and how they affect them.
Ohm's Law:
Ohm's law is also relevant to know of Ohm's Law, which states that the current through a metallic conductor (e.g. wire) at a constant temperature is proportional to the potential difference (voltage). Therefore V ¸ I is constant. This means that the resistance of a metallic conductor is constant providing that the...