As the Ebola virus outbreak continues to run amok in West Africa, scientists are looking ahead to the possibly pivotal use of experimental drugs and vaccines against the disease. It will take months to test, produce and deploy the therapies. But researchers hold out hope that these products — even incompletely vetted — might help to turn the tide against an illness that has defied public health efforts to bring it under control.

Friday 7 October 2011

Difference Between Current and Voltage


Voltage is the Cause, Current is the Effect

Voltage attempts to make a current flow, and current will flow if the circuit is complete. Voltage is sometimes described as the 'push' or 'force' of the electricity, it isn't really a force but this may help you to imagine what is happening. It is possible to have voltage without current, but current cannot flow without voltage.
Switch closedSwitch openNo cell
Voltage and Current
The switch is closed making a complete circuit so current can flow.		Voltage but No Current
The switch is open so the circuit is broken and current cannot flow.		No Voltage and No Current
Without the cell there is no source of voltage so current cannot flow.

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