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Mains Joule & Watt Meter
Mains Joule & Watt Meter (Product Code: SLE/PHY/240) is a compact electronic instrument used to measure the power drawn by, and the energy delivered to, a mains-powered appliance in school and college physics laboratories. Designed for both class demonstration and student use, it reads power on 200 W and 2 kW full-scale ranges and has a built-in timing function. This electronic lab instrument is supplied by Jain Scientific Equipments Pvt Ltd (ScienceLab), Ambala, India.
Specifications
| Parameter | Detail |
|---|---|
| Measures | Power and energy delivered to a mains appliance |
| Power ranges | 200 W and 2 kW full-scale reading |
| Energy ranges | 0 to 999,999 J or 0 to 999,999 kJ |
| Resolution | 0.5 J / 0.5 W on the 200 W range; 0.005 kJ / 0.005 kW on the kW range |
| Maximum current | 10 A, protected by a 10 A fast-blow fuse |
| Isolation | Current transformers and a sampling voltage transformer isolate the unit from the mains |
| Input impedance | 1 MΩ |
| Mains supply | 230 V ±5%, 50 Hz |
| Internal fuse | 315 mA (L) |
| External fuse | 10 A fast blow, in the IEC socket |
| Analogue output | 1 V full-scale instantaneous power indication on a pair of 4 mm meter output sockets, for a datalogger or oscilloscope |
| Energy display | Six 7-segment LEDs |
| Timing | Built-in timing function |
| Accuracy | 3%, typically better than 1% |
| Linearity | 2%, typically better than 1% |
| Dimensions | 208 x 155 x 115 mm (W x H x D); height including handle 187 mm |
| Build | Light and compact |
| Product code | SLE/PHY/240 |
| Supplied by | Jain Scientific Equipments Pvt Ltd (ScienceLab), Ambala, India |
What Is the Mains Joule & Watt Meter Used For?
The appliance under test is plugged into the meter, so students can read how many watts it draws and how many joules it uses over a timed run. Typical practicals include finding the energy consumed by a domestic appliance, comparing the efficiency of different types of lamp bulbs and, with a variable mains transformer unit (required for this test), comparing the power taken by lamp bulbs at different voltages.
Because instantaneous power is also available as an analogue signal on 4 mm sockets, the meter can feed a datalogger or oscilloscope to show how power changes while a lamp warms up or an appliance switches on and off. It is one of the physics lab instruments that turns the relation E = P × t into real readings: note the power, time the run with the built-in timer and compare the result with the energy display. Keep every load within the 10 A maximum and replace fuses only with the listed ratings.
What to Specify When Ordering
- How many meters you need: one for teacher demonstration or several for student groups.
- Whether you also need a variable mains transformer unit for the lamp-voltage comparison.
- Whether readings will be logged on a datalogger or oscilloscope, so connecting items can be quoted together.
- That your laboratory mains matches the 230 V ±5%, 50 Hz supply the meter is specified for.
Supplier
Jain Scientific Equipments Private Limited trades under the name ScienceLab and operates from Ambala, Haryana, India. The company supplies this Mains Joule & Watt Meter as part of its physics laboratory range, so schools, colleges, dealers and training institutes in India and international markets can source electrical-energy instruments together with their other lab equipment from one vendor. Background on the company is on the ScienceLab company profile.
Related Physics Lab Equipment
These items are commonly used alongside the Mains Joule & Watt Meter when teaching electrical power and energy:
- Oscilloscope Dual Trace — displays the meter's analogue power output as a trace.
- Electric Bulb — a lamp for efficiency comparisons (confirm the voltage rating you need).
- Standard Digital Multimeter — for voltage and current checks in low-voltage circuit work.
- Digital Coulomb Meter — a companion digital instrument for charge measurements in electricity topics.
More electrical and mechanics apparatus is listed in the Physics Lab Equipment category.
Frequently Asked Questions
What does the Mains Joule & Watt Meter measure?
The Mains Joule & Watt Meter measures the power, in watts or kilowatts, and the energy, in joules or kilojoules, delivered to a mains appliance plugged into it. Power is read on 200 W or 2 kW full-scale ranges, and energy is counted up to 999,999 J or 999,999 kJ on six LED digits.
How accurate is the Mains Joule & Watt Meter?
The Mains Joule & Watt Meter has a stated accuracy of 3% and linearity of 2%, both typically better than 1%. Resolution is 0.5 J or 0.5 W on the 200 W range and 0.005 kJ or 0.005 kW on the kilowatt range.
Can the Mains Joule & Watt Meter be connected to a datalogger or oscilloscope?
Yes. The Mains Joule & Watt Meter gives instantaneous power as a 1 V full-scale analogue signal on a pair of 4 mm meter output sockets, which can be connected to a datalogger or an oscilloscope to record how an appliance's power changes over time.
What is the maximum load for the Mains Joule & Watt Meter?
The Mains Joule & Watt Meter accepts a maximum current of 10 A, protected by a 10 A fast-blow fuse in the IEC socket, and runs from a 230 V ±5%, 50 Hz mains supply. A separate 315 mA (L) internal fuse protects the unit itself.
Who supplies the Mains Joule & Watt Meter?
The Mains Joule & Watt Meter is supplied by Jain Scientific Equipments Pvt Ltd (ScienceLab) of Ambala, Haryana, India, which serves schools, colleges, dealers and institutional buyers in India and international markets. Contact the team for current availability and a quotation.
Is a calibration certificate available for the Mains Joule & Watt Meter?
Calibration-certificate availability for the Mains Joule & Watt Meter should be discussed with ScienceLab before ordering. Share your requirement through the contact page and the team will confirm what documentation can accompany the instrument.
What should a quotation request for the Mains Joule & Watt Meter include?
A quotation request for the Mains Joule & Watt Meter should state the quantity, whether a variable mains transformer unit is also needed for lamp-voltage tests, any related items such as an oscilloscope, and your delivery location, so everything can be priced together.
Request a Quote
To request a price for the Mains Joule & Watt Meter (SLE/PHY/240), send your quantity and delivery details through the ScienceLab contact page, or add the item to the enquiry cart together with any other laboratory equipment you need.
Last updated: 24 September 2026
