Final answer:
The type of current that produces muscle contractions is alternating current (AC). AC is commonly used in power grids and household appliances, and it is also used in medical treatments like electrical muscle stimulation (EMS) therapy to promote muscle contractions.
Step-by-step explanation:
The type of current that produces muscle contractions is called alternating current (AC).
Alternating current is a type of electric current that periodically reverses direction. It is commonly used in power grids and household appliances.
Alternating current with mechanical effect that helps produce muscle contractions is often used in medical treatments such as electrical muscle stimulation (EMS) therapy. This type of therapy uses AC current to stimulate muscle contractions and promote muscle growth and rehabilitation.