HEAT CAPACITY • ENERGY •
PHYSICS Exclusive
CROSS REFERENCE Immersion Heater, 12V 50W see page 245
Joulemeter and Wattmeter • 4-digit LED display of either energy delivered or power supplied • 6 switch-selectable ranges, with internal shunts • Output sockets suitable for connection to dataloggers & external counters The unit is ideal for accurate measurement of either cumulative electrical energy delivered to a load from a power supply, or instantaneous power. A range of experiments are possible from simple investigations into specific heat capacity to measurement of energy stored in LCR Circuits. When measuring energy delivered, an audible bleep (which can be switched off) indicates each increment of the least significant digit on the display, and the TTL Pulse (of duration 25 ms) is output via 4mm sockets for external counters. When measuring power, a voltage sensor across the 0-10V 4mm socket power output can be used for data-logging. An instruction manual of experiments is included. Display: 4-digit, 20mm high LED display with decimal point automatically moved by the range switch. Input: 24V d.c. max or 17V rms a.c. max of any wave form d.c. to 10kHz. Ranges: from 0.1mJ to 100J per count in 6 decades from 0.001mW to 100W (least significant digit) in 6 ranges LEDs indicate readings in mW and kJ. Power: Mains unit with 1.8m of 3-core cable, illuminated ON/OFF Switch & 1A fuse. Mass: 2.1kg. Sizes: 240 x 160 x 160mm.
B8H28986
each £199.95
Practical Information
USING THE DIGITAL JOULEMETER AND HEATER Known quantities of heat can be supplied to known masses of familiar materials (the Calorimeter blocks, or beakers of water or cooking oil). By comparing the resulting temperature rises, students can appreciate the distinction between heat and temperature. Further quantitative experiments will lead them to a formal definition of specific heat capacity. The relationship between an electric current and its heating effect can also be explored, neatly linking the topics of Energy and Electricity.
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