Disk is most commonly used means of storing programs and data on a computer.
Dynamo is a device for converting mechanical energy into electrical energy.
Dynamometer is an instrument for measuring the electrical power.
Electrocardiograph (ECG) is an instrument used for detection of electric impulses of the heart. It gives a graphic picture of heart beats.
Electroencephalograph (EEG) is an instrument used for recording change in electric potential in various areas of the brain by means of electrodes on the scalp or in the brain itself.
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Electrometer is an instrument for measuring electricity.
Electrophorus is an instrument for generating statical electricity by induction.
Electroscope is an instrument for detecting the presence of electriccharge.
Eudiometer is a glass tube for measuring volume changes in chemical reactions between gases.
