Commit f1c708f8 authored by bindu madhavi's avatar bindu madhavi
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Update disadvantages of relay

parent 3579733b
Their parts can wear out as the switch contacts become dirty - high voltages and currents cause sparks between the contacts.
They cannot be switched on and off at high speeds because they have a slow response and the switch contacts will rapidly wear out due to the sparking.
Their coils need a fairly high current to energise, which means some micro-electronic circuits can't drive them directly without additional circuitry.
The back-emf created when the relay coil switches off can damage the components that are driving the coil. To avoid this, a diode can be placed across the relay coil, as will be seen in any Electronics in Meccano circuits that use relays with sensitive components.
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•Their parts can wear out as the switch contacts become dirty - high voltages and currents cause sparks between the contacts.
•They cannot be switched on and off at high speeds because they have a slow response and the switch contacts will rapidly wear out due to the sparking.
•Their coils need a fairly high current to energise, which means some micro-electronic circuits can't drive them directly without additional circuitry.
•The back-emf created when the relay coil switches off can damage the components that are driving the coil. To avoid this, a diode can be placed across the relay coil, as will be seen in any Electronics in Meccano circuits that use relays with sensitive components.
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